Does Is Prime upload my file or text to Tool-You servers?

No. Is Prime runs in this browser tab. Files stay on the device. Limit note: Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted.

Should I use Prime Factors instead of Is Prime?

Use Is Prime when you need Test whether n is prime. Use Prime Factors when you need Factor an integer into primes. They share a category (Calculate) but not the same job.

What are the limits of Is Prime?

Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted. Also: Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.

Is Prime

Test whether n is prime.

Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.

What Is Prime does

Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.

Practical limit for Is Prime: Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted. That is why output can differ from heavy desktop Calculate software. Read the tool-specific note again: Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.

How to use Is Prime

Confirm you need Is Prime, not Prime Factors (Factor an integer into primes.). Address: /calculate/is-prime.
Enter the numbers or dates Is Prime uses. Test whether n is prime.
Read the result as Is Prime defines it — not as Factorial (n! for 0–200 with digits and trailing zeros.). Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.
Is Prime is an estimate in the browser, not professional advice. Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted.
Need a different formula? Try Factorial (n! for 0–200 with digits and trailing zeros.) instead of stretching Is Prime.

When not to use Is Prime

Skip Is Prime when a neighbor tool matches better — start with Prime Factors or Factorial — or when the description already warns the job will fail. In the tool’s own words: Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.

Questions about Is Prime

What does Is Prime do that other Calculate pages on this site do not?: Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device. Short version: Test whether n is prime.
Does Is Prime upload my file or text to Tool-You servers?: No. Is Prime runs in this browser tab. Files stay on the device. Limit note: Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted.
Should I use Prime Factors instead of Is Prime?: Use Is Prime when you need Test whether n is prime. Use Prime Factors when you need Factor an integer into primes. They share a category (Calculate) but not the same job.
What are the limits of Is Prime?: Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted. Also: Primality test by trial division up to √n for integers in 0…1e9. Returns prime / not prime without sending numbers off-device.