The factors of 2019 are: 1, 3, 673, 2019.
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1, 3, 673, 2019
2019 is a composite number. This is because composite numbers are any number that has more than two factors(one and itself). Therefore, since 3 and 673 are factors of 2019 that makes it a composite number.
2019 is not a prime number. Other than itself and 1, its positive integer factors are 3 and 673.
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.
1, 3, 673, 20191, 3, 673, 2019.