What are the rules to find if a number is divisible by numbers like 2,3, etc.

I can’t give you all the ways to test for divisibility. Here are
some common ones to test for divisibility by:

2: The last digit of
the number is 0 or divisible by 2.

3: The sum of all the digits that
make up the number is divisible by 3

4: The number formed by the
last 2 digits of a number is divisible by 4

5: The last digit of the
number is either 0 or 5.

8: The number formed by the last three
digits of the number is divisible by 8

9: The sum of all the digits
of the number is divisible by 9

11: The sum of the digits which have
a place value that is an even power of ten is equal to the sum of the digits with a place value
that is an odd power of 10