Divisor 9957

To determine if any number is divisible by 9957, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 3319 - then it is divisible by 9957.

The following tests must pass:

• Test if a number is divisible by 3
• The "David Fraser Test" for Divisibility by 3319

Easy!