Divisor 3981

To determine if any number is divisible by 3981, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 1327 - then it is divisible by 3981.

The following tests must pass:

• Test if a number is divisible by 3
• The "plam Test" for Divisibility by 1327

Easy!