Which even number is also a prime number?

The number 2 is the only even number that is classified as a prime number. A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.

In the case of 2, its only divisors are 1 and 2, fulfilling the criteria for being prime.

On the other hand, all other even numbers like 4, 6, and 8 can be divided by 2, which makes them composite rather than prime. They each have divisors beyond just 1 and themselves. For instance, 4 can be divided by 1, 2, and 4; 6 can be divided by 1, 2, 3, and 6; and 8 can be divided by 1, 2, 4, and 8. Therefore, 2 stands out as the sole even prime number.