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Writing a Number as a Product of Its Primes

Which one of ...

Question

Which one of the following is a prime number?

(a) 161
(b) 221
(c) 373
(d) 437

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Solution

(c) 373

373 = 1 × 373
The number 373 has only two factors, 1 and 373.
Hence, it is a prime number.

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