Ofttimes in mathematics, we need to be able to factor a number. Yawn. If a number has only 2 unique factors, it is said to be prime. Prymus tells you whether a number is prime or not, and if it isn't, it will tell you all the prime factors that makes it a 'composite.'

Prime numbers are often used in encryption scenarios so they are not totally lame. Eratosthenes came up with an algorithm to find prime numbers, known as the Sieve of Eratosthenes.

Last update: 08/12/19

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