Check whether a number is prime and find the nearest prime numbers on either side.
Last updated: March 2026 | By ForgeCalc Engineering
Prime Info
Next: 19, previous: 13
A prime number is an integer greater than 1 that has no divisors other than 1 and itself.
Example: 17 is prime, with previous prime 13 and next prime 19.
Is 2 the only even prime?
Yes. Every other even number is divisible by 2 and therefore composite.
What about 1?
1 is not prime by the standard mathematical definition.
Can negative numbers be prime?
No. Prime numbers are defined for positive integers greater than 1.
Does this find nearby primes?
Yes. It shows the next prime and the previous prime when one exists.
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