How to check if the value in a text box is prime or not with jQuery

Question

I am trying to determine whether the value in a text box is prime or not using jQuery.

Here is what I\'ve tried so far, but it\'s not working:

Answer 1

Here is your code slightly modified

DEMO http://jsfiddle.net/72FtQ/1/

function isPrime(n) {

   // If n is less than 2 or not an integer then by definition cannot be prime.
   if (n < 2) {return false}
   if (n != Math.round(n)) {return false}

   // Now check every whole number from 2 to the square root of n. If any of these divides n exactly, n cannot be prime.
   for (var i = 2; i <= Math.sqrt(n); i++) {
      if (n % i == 0) {return false}
   }

   // If n%i was never == 0 above, then n must be prime
   return true;

}

SOURCE http://studymaths.co.uk/topics/checkIfPrime.php