A Prime number is any number that only has only one and itself as factors. By definition even numbers have a factor of two. Therefore the only even number that is also a prime number is two.
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All prime numbers are not odd numbers. 2 is an even prime number, and it is the only even prime number because all other even numbers have 2 as one of their factors.
2 is the only member of both the set of all prime numbers and the set of all even numbers.
Two is even and it's a prime number. All other even numbers can never be prime though because they will always be divisible by 2. So in fact, not all prime numbers are odd, but 2 is the only even prime number.
2 is the only even prime number, because all other even numbers can be divided as 2.
2 is the only prime number, which is even.