Which of the following is a prime number?
The correct answer is 373.
Therefore, if we check for divisors up to $\sqrt{N}$ and find none (other than 1), we can be sure that the number N is prime. For example, when checking 373, we calculated $\sqrt{373} \approx 19.3$. We only needed to check for prime divisors up to 19 (i.e., 2, 3, 5, 7, 11, 13, 17, 19). Since none of these divided 373 evenly, 373 is prime.
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