Count Factors of Number in JavaScript

gistfile1.txt

function getFactorCount(num) {
  if (num === 0) {
    return;
  }

  if (num === 1) {
    return 1;
  }

  let count = 2; // 1 and num;
  const sqrt = Math.sqrt(num);

  for (let i = 2; i < num; i++) {
    if (num % i === 0) {
      count++;
    }

    if (i >= sqrt && count === 2) { // number is prime
      return 2;
    }
  }

  return count;
}