263. Ugly Number

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

/**
 * @param {number} num
 * @return {boolean}
 */
var isUgly = function(num) {
    if (num===1) {
        return true;
    }
    if (num<=0) {
        return false;
    }
    while ((num%2) < Math.pow(10,(-6))){
        num = num/2;
    }
    while ((num%3) < Math.pow(10,(-6))){
        num = num/3;
    }
    while ((num%5) < Math.pow(10,(-6))){
        num = num/5;
    }
    
    if (num===1) {
        return true;
    } else {
        return false;
    }
};