Number 3 rule: If the sum of the digits is a multiple of 3.
Number 4 rule:If the last two digits are a multiple of 4.
Number 5 rule: If it ends with a 5 or a 0.
Number 6 rule: If it is divisible by 2 and by 3.
Number 9 rule: If the sum of the digits are a multiple of 9.
