This free online calculator will let you know whether or not a given number is a prime  with the click of a button.
Plus if it turns out the entry is not a natural number, the calculator will report the first divisor it found, as well as show the equation and the quotient.
If you would like to find all primes for a given composite, please visit the Prime Factorization Calculator.
Or, if you wish to generate a customizable, printable list of primes, please visit the primes list generator.
Primes, or natural numbers are any numbers that are greater than 1 that are only divisible by 1 and the numbers themselves. For example, 13 is a natural number because nothing other than 1 and itself can be divided evenly into 13.
The integer 14, on the other hand, is not a natural because it can be divided evenly by the factors 1, 2, 7, and 14 (see the Factoring Calculator to quickly find all factors of a number). The integer 14 and other nonprimes are also referred to as composite numbers.
With that, let's use the Prime Number Checker to check see if a number is divisible by factors other than just 1 and itself.

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