isPrime.js 237 B

1234567891011
  1. exports = function(num) {
  2. var boundary = Math.floor(Math.sqrt(num));
  3. for (var i = 2; i <= boundary; i++) {
  4. if (num % i === 0) {
  5. return false;
  6. }
  7. }
  8. return num >= 2;
  9. };
  10. module.exports = exports;