How can you tell if a number is divided by 4

If the last two digits of the number are divisible by four

For numbers that have more than 2 places right of the decimal, you can use this step.
Look at the last two places, the tens and ones place, and see if that number is divisible by 4. If it is, then the number is divisible by 4. If it isn't, then the number is not divisble by 4.
The reason you can use this rule is because there are exactly 25 sets of 4's in 100. Let's use some numbers to check this.
The last two places will be in bold since they are important.
303809
Is 9 divisible by 4? No, so this number is not divisible by 4.
3092831
Is 31 divisible by 4? No, so this number also is not divisible by 4.
28384740
Is 40 divisble by 4? Yes, so this number is divisble by 4.