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------------------------------------------------ Explain why 221 and 391 cannot be prime numbers.

Answer :

for a number to be a prime number, it should have only 2 factors (divisible by): 1 and itself.

221 can be divided by 1, 13, 17, and itself so it’s not a prime number

same with 391, it’s not a prime number because it’s divisible by 1, 17, 23, 391

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