No, not all prime numbers are odd. The number 2 is the only even prime number. A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. Since 2 meets this criterion and is even, it is the exception to the rule that prime numbers are odd.
Here’s why 2 is unique:
- It is the smallest prime number.
- It is the only even prime number.
- All other even numbers can be divided by 2, making them composite numbers.
So, while most prime numbers are odd, 2 stands out as the only even prime number.