SumPrimeNonPrime

function primeNonprime(input) {
    let command = input.shift();

    let primeSum = 0;
    let nonPrimeSum = 0;


    while (command != "stop"){
        let num = Number(command);
        if (num < 0) {
            console.log("Number is negative.");
            command = input.shift();
            continue;
        }

        let isPrime = true;

    if (num == 1) {
        isPrime = false;
    } else if (num == 2){
        isPrime = true;
    } else {
        for (let i = num; i >= 2; i--) {
            if (num % i == 0 && i != num) {
                isPrime = false;
                break;
            }
        }

    }


    if (isPrime) {
        primeSum += num;
    } else {
        nonPrimeSum += num;
    }

   command = input.shift();

}