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Prime Numbers

Why is 2019 a prime number?

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Wiki User
October 19, 2010 7:29AM
A prime number has as its only two factors: one and the number. This is not the case for 2019. Just by looking at it an summing up the digits (2+0+1+9 = 12), I know that 2019 is divisible by 3 (so 3 is a factor of 2019), therefore 2019 is not prime.