Look at the rightmost two digits of the number. Are they divisible by 4? If so, the entire number is evenly divisible by 4.

For example:

Is 2,358,224 evenly divisible by 4?

Yes, because 24 is evenly divisible by 4. Doing the check, we see that 589,556 x 4 = 2,358,224.


* This writeup should REALLY be called, "How to determine whether a number is evenly divisible by 4," but I wanted it to fit in with the other "how to determine whether a number is divisible by x" nodes.