Q10. Is the product of two primes numbers also a prime number? Justify.
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Two prime numbers are always co-primes to each other. Example: 7 and 11 are co-primes to each other. (ii) One prime and one composite number are not always co-prime. Example: 3 and 21 are not co-primes to each other.
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A product of two primes can never be prime because the product of two primes p1 and p2 is always divisible by those two primes that are smaller than it and always bigger than 1 which is not prime by definition - and a prime is only divisible by 1 and itself.
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