Prime Number Calculator
Choose a primality check, prime factorization, or prime list. Enter an integer from 2 through 1,000,000.
A QUICK WALKTHROUGH
How to use this tool
- Choose primality check, factorization, or prime listing.
- Enter an integer from 2 to 1,000,000.
- Review the result calculated locally in your browser.
Accepted integer range
Every operation accepts integers from 2 through 1,000,000. Zero, negative values, decimals, and larger inputs are rejected.
Three local operations
The calculator tests primality, returns prime factors, or lists all primes up to the entered limit. The work runs in your browser.
GOOD TO KNOW
Common questions
Is 1 prime?
No. Prime numbers are integers greater than 1 with exactly two positive divisors.
Can I enter decimals or negative integers?
No. Enter a whole number from 2 through 1,000,000.