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Prime Number Checker
Check if a number is prime and find prime numbers
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Education & Learning ✅ Free to Use
Prime Number Checker
Check if numbers are prime, find all factors, or discover prime numbers in a range. Perfect for mathematics, cryptography, and number theory studies.
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17 is Prime
This number is only divisible by 1 and itself
13
Previous Prime
19
Next Prime
Factors of 17
1
17
17 has 2 factors
Prime Number Facts
📚 Definition
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
🔢 First 10 Primes
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
🔐 Applications
Prime numbers are crucial in cryptography, computer science, and mathematical research. RSA encryption relies on large primes.
✨ Fun Facts
2 is the only even prime number. There are infinitely many primes (proven by Euclid ~300 BC).