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  1. Which one of the following is a prime number ?

    2. A.

    161
    B.

    221
    C.

    373
    D.

    437
    E.

    None of these

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    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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