Unit Converters · Free tool
Prime Number Checker
Check whether any number is prime. Also shows its factors if composite. Fast in-browser math.
60 is
Not prime
Prime factorization
60 = 2² × 3 × 5
Divisors
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 (12 total)
Previous prime
59
Next prime
61
What it does
Check whether a number is prime, and if not, see its full prime factorization. Enter any integer up to about a trillion (1e12) and the tool returns yes/no, the prime factorization in exponent notation (60 = 2² × 3 × 5), a list of divisors, and the next and previous prime numbers.
Uses 6k±1 trial division — practical for numbers up to ~10¹². For much larger inputs you'd want Miller-Rabin; this tool targets education and quick math. See also number base converter for binary/hex representations and fraction calculator for GCD-heavy math.
How to use it
- Enter any integer up to 1e12.
- See the prime/composite verdict and factorization.
- Scroll the divisor list and the next/previous primes.
- Try another number anytime.