Program that checks if a number is prime number

Question

Hello I have created this program to check if a number is a prime number. It works but for some reason says that 999 is a prime number. Where is my mistake. It would be grea

Answer 1

The judgment has a problem, can only be 1 or the prime number is divisible by itself. You judge is only 2 out of the whole is not a prime number, you should use a double loop to do the conditions of judgment