Prime number check

by Siva Subramaniam

JavaScript

function isPrime(input) {
    var sqrt, i, result = false;
    if (typeof input !== undefined && input > 1 && input === Math.round(input)) {
        sqrt = Math.sqrt(input);
        for (i = 2; i <= sqrt; i++) {
            if (input % i === 0) {
                return false;
            } else {
                continue;
            }
        }
        result = true;
    }
    return result;
}

//alert(isPrime(12));