is prime?

is-prime.js

// A prime number is a natural number that has exactly two distinct natural number divisors: 1 and itself.

const isPrime = (function () {
    let primes = {};
    let notPrimes = {};

    return function (number) {
        if(primes[number]) return true;
        if(number === 1 || notPrimes[number]) return false;

        for (let i = 2; i <= parseInt(Math.sqrt(number)); i++) {
            if (number % i === 0) {
                notPrimes[number] = true;
                return false;
            }
        }
        primes[number] = true;
        return true;
    }
})();


[1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 907].forEach(value => console.log(isPrime(value)));