Question

please do please
dav
class-VI ​

Answer 1

To prove whether a number is a prime number, first try dividing it by 2, and see if you get a whole number. If you do, it can't be a prime number. If you don't get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number.

Step-by-step explanation:

Prime factorization: 397 is prime. The exponent of prime number 397 is 1. Adding 1 to that exponent we get (1 + 1) = 2. Therefore 397 has exactly 2 factors.