Checks a number against the common divisibility tests for 2, 3, 4, 5, 6, 8, 9, and 10 all at once.
How it works
The number is checked against each divisor directly — if dividing leaves no remainder, it’s divisible.
What this does not include
This does not include prime factorization — for breaking a number down into its prime factors, use this site’s factor calculator instead.
How to use this calculator
- Enter a whole number.
Frequently asked questions
What’s a quick way to check divisibility by 3?
Add up all the digits — if that sum is divisible by 3, so is the original number. The same trick works for divisibility by 9.
Why is divisibility by 4 different from divisibility by 2?
Divisibility by 2 only depends on the last digit being even, but divisibility by 4 depends on the last two digits forming a number divisible by 4.
Is every number divisible by 6 also divisible by both 2 and 3?
Yes — since 6 = 2 × 3, a number divisible by 6 must be divisible by both of its prime factors.
