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A number is divisible by 2 if its last digit is even (0, 2, 4, 6, or 8).

A number is divisible by 11 if the difference between the sum of the digits in the odd positions and the sum of the digits in the even positions is either 0 or divisible by 11.

A number is divisible by 5 if its last digit is 0 or 5.

To check if a number is divisible by 7, take the last digit, double it, and subtract it from the rest of the number; if the result is divisible by 7, then the original number is as well.

A number is divisible by 3 if the sum of its digits is divisible by 3.

A number is divisible by 6 if it is divisible by both 2 and 3.

A number is divisible by 9 if the sum of its digits is divisible by 9.

A number is divisible by 10 if its last digit is 0.

A number is divisible by 4 if its last two digits form a number that's divisible by 4.