Divisor 15191

To determine if any number is divisible by 15191, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 11 and 1381 - then it is divisible by 15191.

The following tests must pass:

• Test if a number is divisible by 11
• The "Hugo Chargois Test" for Divisibility by 1381

Easy!