isPrimeNumber.js

// number > 1 is a prime if it can’t be evenly divided by anything except 1 and n.

// define var n
let n = 1000;

nextPrime:
for (let i = 2; i <= n; i++) { // for each i do...

  for (let j = 2; j < i; j++) { // look for a divisor..
    if (i % j == 0) continue nextPrime; // not a prime, go next i
  }

  console.log( i ); // a prime
}