{"id":5170,"date":"2022-01-01T23:15:00","date_gmt":"2022-01-01T17:45:00","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=5170"},"modified":"2022-01-01T11:56:06","modified_gmt":"2022-01-01T06:26:06","slug":"python-program-to-check-prime-number","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/python-program-to-check-prime-number\/","title":{"rendered":"Python Program to Check Prime Number"},"content":{"rendered":"\n<p>In this post, we will learn <strong>how to check prime numbers using Python<\/strong> Programming language.<\/p>\n\n\n\n<p>A<strong> prime number<\/strong> is a whole number greater than <strong>1<\/strong>, and has exactly two factors that is<strong> 1<\/strong> and the <strong>number itself<\/strong>. For example: 2, 3, 5, 7, 11, 13, 17, . . . and so on.<\/p>\n\n\n\n<p>We will be using following approaches to check prime number:<\/p>\n\n\n\n<ol><li>Using a flag Variable<\/li><li>Using If-Else Statement<\/li><\/ol>\n\n\n\n<p>So, without further ado, let\u2019s begin this tutorial.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-662c210205498\" class=\"ez-toc-cssicon-toggle-label\"><label class=\"ez-toc-title\">Table of Contents<\/label>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0090ff;color:#0090ff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0090ff;color:#0090ff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662c210205498\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.codingbroz.com\/python-program-to-check-prime-number\/#Python_Program_to_Check_Prime_Number\" title=\"Python Program to Check Prime Number\">Python Program to Check Prime Number<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.codingbroz.com\/python-program-to-check-prime-number\/#How_Does_This_Program_Work\" title=\"How Does This Program Work ?\">How Does This Program Work ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.codingbroz.com\/python-program-to-check-prime-number\/#Python_Program_to_Check_Prime_Number_Using_If_Else_Statement\" title=\"Python Program to Check Prime Number Using If Else Statement\">Python Program to Check Prime Number Using If Else Statement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.codingbroz.com\/python-program-to-check-prime-number\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Python_Program_to_Check_Prime_Number\"><\/span><strong>Python Program to Check Prime Number<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Python Program to Check Prime Number\nnum = int(input(\"Enter a number: \"))\n\n# defining a flag variable\nflag = 1\n\n# Checking for factors\nfor i in range(2, int (num\/2)):\n    if num % i == 0:\n        flag = 0\n        break\n\n# Display output\nif flag == 1 and num >= 2:\n    print(num, \"is a prime number.\")\nelse:\n    print(num, \"is not a prime number.\")\n<\/pre>\n\n\n\n<p><strong>Output 1<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enter a number: 17\r\n17 is a prime number.\r<\/code><\/pre>\n\n\n\n<p><strong>Output 2<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enter a number: 25\r\n25 is not a prime number.\r<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_This_Program_Work\"><\/span><strong>How Does This Program Work ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">num = int(input(\"Enter a number: \"))\n<\/pre>\n\n\n\n<p>The user is asked to enter a number. The entered number gets stored in the<strong> num<\/strong> named variable.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># defining a flag variable\nflag = 1\n<\/pre>\n\n\n\n<p>We define a variable named<strong> flag<\/strong>. Flag variable has assigned a value of <strong>1<\/strong>.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Checking for factors\nfor i in range(2, int (num\/2)):\n    if num % i == 0:\n        flag = 0\n        break\n<\/pre>\n\n\n\n<p>Then, we check whether there is any factor of<strong> num<\/strong> greater than <strong>2<\/strong>. If yes, then the flag becomes <strong>0<\/strong> and the loop terminates.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">if flag == 1 and num >= 2:\n    print(num, \"is a prime number.\")\nelse:\n    print(num, \"is not a prime number.\")\n<\/pre>\n\n\n\n<p>If the value of the flag is <strong>1<\/strong> and <strong>num >= 2<\/strong>, then in this case the entered number doesn\u2019t have any factors greater than <strong>2<\/strong> so, it is a prime number otherwise the entered number is not a prime number.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Python_Program_to_Check_Prime_Number_Using_If_Else_Statement\"><\/span><strong>Python Program to Check Prime Number Using If Else Statement<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Python Program to Check Prime Number Using If-Else Statement\nnum = int(input(\"Enter a number: \"))\n\nif num > 1:\n    for i in range(2, num):\n        if (num % i == 0):\n            print(num, 'is not a prime number.')\n            break\n    else:\n        print(num, 'is a prime number.')\n            \n# If entered number is less than 1, then it is not a prime number\nelse:\n    print(num, \"is not a prime number.\")\n<\/pre>\n\n\n\n<p><strong>Output 1<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enter a number: 13\r\n13 is a prime number.\r<\/code><\/pre>\n\n\n\n<p><strong>Output 2<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enter a number: 91\r\n91 is not a prime number.\r<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>I hope after going through this post, you understand<strong> how to check prime numbers using Python<\/strong> Programming language.<\/p>\n\n\n\n<p>If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to assist you.<\/p>\n\n\n\n<p><strong>Also Read:<\/strong><\/p>\n\n\n\n<ul><li><strong><a href=\"https:\/\/www.codingbroz.com\/python-program-to-check-leap-year\/\">Python Program to Check Leap Year<\/a><\/strong><\/li><li><strong><a href=\"https:\/\/www.codingbroz.com\/python-program-to-solve-quadratic-equation\/\">Python Program to Solve Quadratic Equation<\/a><\/strong><\/li><li><strong><a href=\"https:\/\/www.codingbroz.com\/python-program-to-reverse-a-string\/\">Python Program to Reverse a String<\/a><\/strong><\/li><li><strong><a href=\"https:\/\/www.codingbroz.com\/python-program-to-find-the-square-root\/\">Python Program to Find the Square Root<\/a><\/strong><\/li><li><strong><a href=\"https:\/\/www.codingbroz.com\/python-program-to-generate-a-random-number\/\">Python Program to Generate a Random Number<\/a><\/strong><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In this post, we will learn how to check prime numbers using Python Programming language.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[91,417],"tags":[214,497,212],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/5170"}],"collection":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/comments?post=5170"}],"version-history":[{"count":3,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/5170\/revisions"}],"predecessor-version":[{"id":5173,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/5170\/revisions\/5173"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=5170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=5170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=5170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}