Prime Number Checker — Is It Prime?

Enter an integer to test primality; if composite, see the smallest prime factor and full factorization.

Examples

What is the smallest prime?

2 is the smallest and only even prime number.

Calculate percentages, find what percent one number is of another, and track percentage c…

Solve complex math problems instantly with our free online scientific calculator, featuri…

Easily add, subtract, multiply, and divide fractions. Get the simplified fractional resul…

Simplify any ratio A:B to its lowest terms.

Solve for the missing value in a proportion A:B = C:D.