Divisor 22991

To determine if any number is divisible by 22991, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 83 and 277 - then it is divisible by 22991.

The following tests must pass:

• Test if a number is divisible by 83
• Test if a number is divisible by 277

Easy!