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Question
State if the following is a prime number?
331
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Solution
A number between 100 and 200 is a prime number if it is not divisible by any prime number less than 15.
Similarly, a number between 200 and 300 is a prime number if it is not divisible by any prime number less than 20.
331 is a prime number because it is not divisible by 2, 3, 5, 7, 11, 13, 17, and 19.
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