function isPrime(n) {
    if (n < 2 || n != Math.trunc(n))
        return false;
    for (let i = 2; i * i <= n; ++i)
        if (n % i == 0)
            return false;
    return true;
}

if (!module.parent)
    console.log(isPrime(Number(process.argv[2])) ? 'prime' : 'no prime');