1349.
1349
1349
4284
1155
1
1 3 4 9
208
The number must meet two criteria:Take the original number excluding its last digit and subtract two times the last digit from it. The result must be divisible by 7.Take the original number excluding its last digit and subtract nine times the last digit from it. The result must be divisible by 13.In both cases, you can repeat the "truncate-and-subtract multiple" stage several times, if required.
The number 2464 fulfils the requirements.
If you mean what is the divisibility rule for the number 8: There are two: 1. For any power n of 2 the last n digits of the number must be divisible by 2 to the power n. 8 = 2³ → If the last 3 digits are divisible by 3, then so is the whole number. 2. Add the last (ones) digit to 2 times the tens digit to 4 times the hundreds digit; if this sum is divisible by 8, then so is the original number. As the test can be repeated on the sum, repeat until a single digit remains. If, and only if, this digit is 8 will the number be divisible by 8.
The last digit of the number 42012 is 2.
Look at the last digit. If a number's last digit is even, the number is even. If the last digit is odd, the number is odd.
Look at the last digit. If the last digit is even, the entire number is even. If the last digit is odd, the entire number is odd.