The unique even prime number 2. All other primes are odd primes. Humorously, that means 2 is the "oddest" prime of all.

The sequence 2, 4, 6, 10, 14, 22, 26, 34, 38, ... (OEIS A001747) consisting of the number 2 together with the primes multiplied by 2 is sometimes also called the even primes, since these are the even numbers that are divisible by just 1, 2, , and .

More things to try:

Weisstein, Eric W. "Even Prime." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EvenPrime.html