3 years ago

Explain why 221 and 391 cannot be prime numbers

1 answer:

4 0

Answer:

it would have been required that 221 has only two divisors. i.e., itself and 1. However, 221 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 221 = 13 x 17, where 13 and 17 are both prime numbers.

Step-by-step explanation:

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