Is Prime Number??

isPrime.js

function isDivisible(dividend, divisor) {
    return dividend % divisor === 0;
}

function isPrime(n) {
    var factor = 2;

    n = Math.abs(n);

    if (n <= 1) {
        return true;
    }

    while (factor < n) {
        if (isDivisible(n, factor)) {
            return false;
        }

        factor += 1;
    }

    return true;
}