A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is prime because 1 and 5 are its only positive integer factors, whereas 6 is composite because it has the divisors 2 and 3 in addition to 1 and 6.

This app can be used to check whether the given number is a prime number or not in seconds. You can check up-to 18 digit number. Very useful tool for students, math experts, and any other people who deals with numbers.