2 is because the last digit ends in 0,2,4,6,8
3 is because the sum of its digit ends is divisible by 3
4 is because the last two digits are divisible by 4
5 is because it ends with a 0 or 5
6 is because it is divisible by both 2 and 3
7 IS NOT because we multiply each digit by 1,3,2,6,4,5 working backward
8 IS NOT because the last three digits are not divisible by 8
9 IS NOT because the sum of its digits is not divisible by 9
10 is because its ends with 0
