Because 2 can only be multiplied by 1 and itself.
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2 is even, and it is a prime number. No other even number is prime, since by definition, an even number has 2 as a factor.
Julia is incorrect. 2 is an even prime number and 9 is an odd composite number.
The only even prime number is the smallest even number, 2. This is because every other even number is divisible by 2. The only even prime number is 2. All other even numbers can be divided by 2. Although 2 is divisible by, 2, 2=2, meaning that 2 only has 2 factors-the number itself (2) and 1. Confusing enough? In simpler form, the only even prime number is 2. Because a prime number is a number whose only factors are 1 and itself, 2 can be the only even prime number since it divides evenly into every other even number.
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There are an infinite number of odd prime numbers, but 2 is the only even prime .