Assistance needed, please!

I use the return:

var primeNumber = function (x) {
    for (i = 2; i < x; i++) {
        if (x % i === 0)
            return(x + " is not a prime number.");
    }
    return(x + " is a prime number.");
};
primeNumber(15);

In your exercise you should only use the console.log ()?

Or this:

var primeNumber = function (x) {
    for (i = 2; i < x; i++) {
        if (x % i === 0){
            console.log(x + " is not a prime number.");
            return;
        }
    }
    console.log(x + " is a prime number.");
};
primeNumber(9);