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

Create Ugly_Number.java