Discussion :: Numbers

Which one of the following is a prime number ?
Answer : Option C
Explanation :
\(\sqrt{437}\) greater than 22
All prime numbers less than 22 are : 2, 3, 5, 7, 11, 13, 17, 19.
161 is divisible by 7, and 221 is divisible by 13.
373 is not divisible by any of the above prime numbers.
373 is prime.
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