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The square root from 1987 is less than 45, so we should check the division by the numbers less than 45.
1987 is not divided by 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 - hence it is a Prime number/
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Earn +20 ptsQ: Is 1987 a prime or composite number?
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