If you count zero as an even number (and there are arguments for and against that) then it is one that is not divisible by two.
Additional Information:-
Zero is an even number because it's between two odd numbers which are -1 and +1
So therefore 0 is not divisible by 2
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Two is the only even number that is prime. A prime number is one divisible only by one and itself. Every even number larger than two is divisible by two; hence, it is not prime. Whilst 2 is also divisible by 2, it is not divisible by any number other than 1 and itself; thus, 2 is the only even number that is also prime.
All other even numbers are divisible by two. Since two is only divisible by one and itself, it is prime.
By definition, a prime number is evenly divisible only by 1 and by itself. And also by definition, an even number is any number that is evenly divisible by two. The only number that satisfies both of these defined conditions is the number two.
An even number.
If a number is even, it's divisible by two.