Question

test whether 221 is a prime or not ​

Answer 1

For 221 to be a prime number, 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.

Answer 2

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Solution :-

221 is not divisible by any number except 1 & 221 so....

It's a prime number....

But on the other hand it is a composite number because 13 ×17 =221 ...

It is a product of two prime numbers so can be called as semi prime (bi -prime) number....

So we concluded that 221 is a semi prime number....

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