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Yes it is. The square root of 1997 is between 44 and 45, so an exhaustive check of possible factors only requires testing divisibility by the following list of potential prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, and 43.

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Q: Is 1997 a prime number
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