Easily test if any number is evenly divisible by 12
Example
Is 1324536 divisible by 12?
Yes
Step 1
Divide the last two digits by 4.
36 / 4 = 9
Step 2
If the result of step 1 is a whole number then continue
Yes, continue
Step 3
Add together each digit in the original number
1 + 3 + 2 + 4 + 5 + 3 + 6 = 24
Step 4
Divide step 3 by 3.
24 / 3 = 8
Step 5
The original number is evenly divisible by 12 if the result of step 4 is a whole number.
Yes