Divisor 25983

To determine if any number is divisible by 25983, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 2887 - then it is divisible by 25983.

The following tests must pass:

• Test if a number is divisible by 9
• The "Spinning Rail Test" for Divisibility by 2887

Easy!