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39 votes
39 votes
Explain why 221 and 391 cannot be prime numbers

User Jacob Oscarson
by
2.4k points

1 Answer

16 votes
16 votes

Answer:

because the product of a two non-necessarily distinct prime numbers

Explanation:

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)

User Don Pflaster
by
2.6k points
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