Question

determine the largest prime number that you need to test as a divisor to find whether or not 397 is a prime number ​

Answer 1

Step-by-step explanation:

19,The floor of the spuare root of 397

So if none of the number 2,3,5, 11,13 17 19 evenly divide 397

Then 397 is a prime number

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Answer 2

Given  : Number = 397

here , we need to check the prime numbers which are less than and equal to square root of the number

here , The number is 397

the square root of 397 is

√397 = 19.92

so , we need to check the prime numbers upto 19

i.e

largest prime number that we need to test as a divisor to find whether or not 397 is a prime number is 19

hence , required  largest prime number is 19

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