JavaScript Program to Check Prime Number Example

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Now let's see example of how to check prime number example. We will use how to check prime number in javascript. This is a short guide on check prime number. Let's get started with how to check prime number in javascript.
Here i will give you many example how you can check prime number javascript.
Example : 1<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>JavaScript Program to Check Prime Number Example - MyWebtuts.com</title> </head> <body> <h2>JavaScript Program to Check Prime Number Example - MyWebtuts.com</h2> <script type="text/javascript"> const num = parseInt(prompt("Enter a positive Number: ")); let isPrime = true; if (num === 1) { document.write("1 is neither Prime nor composite Number."); } else if (num > 1) { for (let i = 2; i < num; i++) { if (num % i == 0) { isPrime = false; break; } } if (isPrime) { document.write(`${num} is a Prime Number`); } else { document.write(`${num} is not a Prime Number`); } } else { document.write("The Number is not a Prime Number."); } </script> </body> </html>Output :

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>JavaScript Program to Check Prime Number Example - MyWebtuts.com</title> </head> <body> <h3>JavaScript Program to Check Prime Number Example - MyWebtuts.com</h3> <form name="myform"> Enter the number: <input type="text" name=n value=""> <br><br> <input type="button" value="Check" onClick="test()"> <br> </form> <script type="text/javascript"> function test() { var n, i, flag = true; n = document.myform.n.value; n = parseInt(n) for(i = 2; i <= n - 1; i++) if (n % i == 0) { flag = false; break; } if (flag == true) alert(n + " is Prime Number"); else alert(n + " is not Prime Number"); } </script> </body> </html>Output :

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