Which one of the following is not a prime number?
- 91
- 71
- 61
- 31
Explanation
91 is not a prime number because it is divisible by 7 and 13 (91 = 7 × 13).
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers.
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- 10
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- None of these
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- None of these
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