Prime Number Checker
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Three tools in one. The primality checker tests any number up to 10,000,000 and shows all factors if the number is composite, plus the next prime above your input. The range generator uses the Sieve of Eratosthenes to find all primes between two numbers and displays them in a clean grid. The factorization tool breaks any number into its prime factors and displays them in exponential notation (e.g., 360 = 2³ × 3² × 5). All calculations run instantly in your browser. Essential for number theory, cryptography study, and math homework.
How to Use
- 1Choose a tab: Check Prime, Find Primes in Range, or Factorize
- 2For Check Prime: enter any number up to 10,000,000 and click Check - see if it's prime or its factors
- 3For Sieve: enter a start and end number to see all primes in that range displayed as a grid
- 4For Factorize: enter any number to see its prime factors in exponential form (e.g. 360 = 2³ × 3² × 5)
Features
- Primality check for numbers up to 10,000,000 with next-prime finder
- Sieve of Eratosthenes range generator with grid display
- Prime factorization with exponential notation (e.g. 2³ × 3² × 5)
- Shows all factors for composite numbers
- 100% browser-based
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