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.