Unit Converters · Free tool
Prime Number Checker
Test any number for primality and find all its factors instantly in your browser. Free, no-registration tool for fast math checks.
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
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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.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/prime-number-checker" width="100%" height="720" frameborder="0" loading="lazy" title="Prime Number Checker" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>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.
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Guides about this topic
- How-To & Life · GuideHow to check prime numbersVerify prime numbers with trial division, Sieve of Eratosthenes, Fermat and Miller-Rabin tests. Instant, online guide covers cryptography fundamentals.
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