Javascript Find Prime Factor and The Largest

primeFactor.js

var divisor = 2;
var number = 210;
let primeFactor = [];

while (number > 1) {
  if (number % divisor === 0) {
    number /= divisor;
    if (primeFactor.indexOf(divisor) === -1) {
      primeFactor.push(divisor);
    }
  } else {
    divisor++;
  }
}
console.log(divisor);
console.log(primeFactor);

Output:

7
[2, 3, 5, 7]