If a number is divisible by 2, it will be even. This means it will end in a 0, 2, 4, 6, or 8. 79,112 ends in a 2, so it is divisible by 2.
If a number is divisible by 3, the sum of its individual numbers will be divisible by 3 as well. Since 7+9+1+1+2=20, and 20 is not divisible by 3, 79,112 is not divisible by 3.
If a number is divisible by 5, it will end in a 5 or a 0. 79,112 does not, so it is not divisible by 5.
If a number is divisible by 9, the sum of its individual numbers will be divisible by 9 as well. Since 7+9+1+1+2=20, and 20 is not divisible by 9, 79,112 is not divisible by 9.
If a number is divisible by 10, it will end in a 0. 79,112 does not, so it is not divisible by 10.