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### Discussion :: Numbers

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

2.  A. 161 B. 221 C. 373 D. 437 E. None of these

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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