Free Prime Number & Factor Calculators
Check primality, factorize numbers, compute GCD/LCM, and more. Simple, fast, and free.
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🔑 Prime Check primality, factorize, generate prime lists, and find twin primes. 5 tools 🧩 Factors Find all factors, factor pairs, common factors, and check divisibility. 5 tools 🔗 GCD/LCM Calculate GCD, LCM, use the Euclidean algorithm, and check coprimality. 5 tools
Popular Tools
🔑 Prime Number Checker Check whether any integer is a prime number instantly.... 🔑 Prime Factorization Calculator Find the prime factorization of any positive integer.... 🔑 Prime Number Generator Generate a list of all prime numbers up to any limit N.... 🧩 Factor Calculator Find all factors of any positive integer.... 🧩 Factor Pairs Calculator Find all factor pairs (a, b) where a × b = N.... 🧩 Common Factors Calculator Find all common factors of two numbers.... 🔗 GCD Calculator Find the Greatest Common Divisor (GCD) of two numbers.... 🔗 LCM Calculator Find the Least Common Multiple (LCM) of two numbers.... 🔗 Euclidean Algorithm Calculator Step-by-step Euclidean algorithm to find GCD with full worki...
About PrimeCalc
PrimeCalc provides free, fast, and accurate number theory tools for students, educators, and curious minds. Check primes, factorize integers, compute GCD and LCM, and more — all instant, no registration required.
Why Use PrimeCalc?
- Instant Results: All calculations run in your browser
- Step-by-Step: See the algorithm working (Euclidean, Sieve)
- No Limits: Check any integer, generate prime lists up to 10,000
- Free: No registration, no fees, no limits