Divisibility rules for numbers 2-6 - metatutor.co.uk So to check if a number is divisible by 6, we just apply the rules for 2 and 3 from above. So, a number is divisible by 6 if it ends in an even number AND its digits add to a multiple of 3. For example, let's test 624. It ends in 4, so it is divisible by 2. 6 + 2 + 4 = 12, and 12 is a multiple of 3.