A number is divisible by 2 if …
it is an even number.
A number is divisible by 3 if…
the sum of the digits is divisible by 3.
A number is divisible by 4 if…
the last two digits are both zeros or if they are divisible by 4.
A number is divisible by 5 if…
the units’ digit is 0 or 5.
A number is divisible by 9 if…
the sum of the digits is divisible by 9.
A number is divisible by 10 if…
the units’ digit is 0.