Check if a large number is divisibility by 15

Given a very large number. Check its divisibility by 15.

Examples:

Input: "31"
Output: No
Input : num = "156457463274623847239840239
 402394085458848462385346236
 482374823647643742374523747
 264723762374620"
Output: Yes
Given number is divisible by 15

A number is divisible by 15 if it is divisible by 5 (if the last digit is 5 or 0), and it is divisible by 3 (if sum of digits is divisible by 3).

Below is the implementation of above approach.

No
Yes

Time complexity: O(number of digits) 
Auxiliary space: O(1)