Don't like ads? Go Ad-Free Today
Prime Number Checker
DeveloperMath
ADVERTISEMENT · REMOVE?
ADVERTISEMENT · REMOVE?
Guide
What is a Prime Number?
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. This tool checks if a number is prime and shows its factors.
Key Features
- Check if any number is prime
- View all factors of a number
- Find prime factorization
- Support for large numbers
How to Use
- Enter a number
- See if it is prime or composite
- View the factors and prime factorization
Want To enjoy an ad-free experience?
Go Ad-Free Today
Install Our Extensions
Add IO tools to your favorite browser for instant access and faster searching
恵 Scoreboard Has Arrived!
Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
ADVERTISEMENT · REMOVE?
Must-Try Tools
View AllADVERTISEMENT · REMOVE?
New Arrivals
View AllUpdate: Our latest tool was added on Feb 15, 2026
Get Involved
Help us continue providing valuable free tools
ADVERTISEMENT · REMOVE?