Divisor 6445

To determine if any number is divisible by 6445, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 5 and 1289 - then it is divisible by 6445.

The following tests must pass:

• Test if a number is divisible by 5
• The "Rick Schrijver Test" for Divisibility by 1289

Easy!