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Definition

Prime Number

A prime number is a counting number greater than 11 whose only factors are 11 and itself. For example, 77 is prime because no counting number other than 11 and 77 divides it evenly. The prime numbers less than 2020 are 2,3,5,7,11,13,17,2, 3, 5, 7, 11, 13, 17, and 1919. Notably, 22 is the only even prime number — every other even number has 22 as an additional factor, making it composite rather than prime.

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Updated 2026-04-21

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