Since there are no integer numbers between two and one, how can two be divisible by a number other than itself and one?
Perhaps the definition of prime numbers is irrational and wrong, at least for two.
Why is 2 considered a prime number?
I think a prime number is a number that is divisible only by itself and one when there is a number between itself and one, and this definition does not include the number two. A prime number must be able to be tested or tried by any number other than itself or one. All prime numbers are testable except 2. A prime number must be able to be tested by any number other than itself and one before being called a prime number. 2 cannot be tested by any number other than itself and one, therefore it cannot be called a prime number. The un-testability of the number of two makes it impossible to judge whether it is a prime number or not.