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1881 is not prime; its prime factors are 3 x 3 x 11 x 19.

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Is 1881 prime or composite?

Composite, 1881 divided by 3 equals 627.1881 is divisible by 9 as well. You can determine this by adding up the digits:1 + 8 + 8 + 1 = 18 (which is divisible by 9, so the original number is divisible by 9).This trick works to determine if a number is divisible by 3 as well (if the sum of digits is divisible by 3, then the number is divisible by 3).Since 1881 has factors of 1881, 1, 9 and (1881 / 9 = 209) and you can stop there; you have determined that the number is not prime. {By the way, 11 & 19 are also factors}Every number has factors of itself and 1. If it has other factors beside that, then it is composite. If those are the only 2 factors, then the number is prime.If a number X is divisible by another number M, then M is a factor of X.


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What is 1921 minus 1881?

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