If the last two digits of the integer are divisible by 4 then so is the whole number.
^^To tell if the last two digits are divisible by 4, you just need to know all the numbers up to 100. Personally, I just memorize 4, 8, 12, 16, and just add them to increments of 20 to check.
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The number 24 can be divided by 4 to get 6.
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2.
-1
A prime number can only be divided by itself and 1. 4 can be divided by 2 26 can be divided by 2 15 can be divided by 3
2.5