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

if (num > 0)
    for (int i=2; i<6; i++)
        while (num % i == 0)
            num /= i;
return num == 1;