determine the largest prime number that you need to test as a divisor to find whether or not 397 is a prime number
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397 = 1×397 [There is no factor of 397 other than 1 and 397.] So, the greatest prime number by which 397 will get divided is 397. Hence, the number is 397 and it is a prime number number as it has no factor other than itself and 1.
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