Is 1 a Prime Number?
1 is not a prime number by mathematical definition, as primes must have exactly two distinct divisors.
How to use this tool
- Enter number in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your result and the full breakdown beneath it.
1 is not considered a prime number — use this checker to see why and explore the definition.
Frequently asked questions
- What is a prime number?
- A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.