Math & Everyday Calculators

Prime Number Checker

Use Prime Number Checker free in your browser. No account required; your input is processed locally in your browser.

Runs locallyYour inputs stay in your browser.
Workspace
Result
—
HOW IT IS CALCULATED

Check whether an integer is prime

UtilityLake checks whether the integer has any divisor other than 1 and itself.

Instant resultClear formulaRuns locally
01Values
02test divisors up to √n
03Result

97 → prime

GOOD TO KNOW

You only need to test divisors up to the square root

If a larger divisor exists, it must be paired with a smaller divisor that would already have been found.

02

In short

What logic does the calculator use?

test divisors up to √n

Example?

97 → prime