263. Ugly Number Java Solutin

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.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

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public class Solution {
    public boolean isUgly(int num) {
        if(num < 1 ) return false;
        while(num%2 == 0) num /= 2;
        while(num%3 == 0) num /= 3;
        while(num%5 == 0) num /= 5;
        if(num == 1) return true;
        return false;
    }
}