9991

This number is a composite.

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Q: Is 9991 prime? A: 9991 = 10000 – 9 = 100^2 – 3^2 = (100 – 3)(100 + 3) = 97 * 103. Therefore, the number 9991 is composite. [Haratis]

Submitted: 2019-01-11 16:11:41;   Last Modified: 2019-01-11 16:13:41.
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