leetcode-java-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. */ public class Solution {     public boolean isUgly(int num) {         if(num <= 0) {             return false;         }         if(num == 1) {             return true;         }         while(num % 2 == 0 && num >=2) {             num = num/2;         }         while(num % 3 == 0 && num >=3) {             num = num/3;         }         while(num % 5 == 0 && num >=5) {             num = num/5;         }         return num == 1;     } }