Divisor 9509

To determine if any number is divisible by 9509, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 37 and 257 - then it is divisible by 9509.

The following tests must pass:

• Test if a number is divisible by 37
• Test if a number is divisible by 257

Easy!