Prime Number Checker
Check if numbers are prime and list all prime numbers up to N.
How to Use Prime Number Checker
1
Enter a number to check
2
View if it's prime and its factors
3
Optionally list all primes up to N
Key Features
Primality test
List primes up to N
Factor display for non-primes
Fast algorithm
Tips & Tricks
2 is the only even prime number
Every number greater than 1 has at least one prime factor
Frequently Asked Questions
The checker works efficiently for numbers up to several million. Very large numbers may take a moment to process.