Is x an even integer?

[Gmat_mission]

Is x an even integer?

(1) x is the square of an integer.
(2) x is the cube of an integer.

[spoiler]OA=E[/spoiler]

For me, this is a tough and tricky question. I am not so good with number properties. Might someone help me? Thanks.

[GMATGuruNY]

Is x an even integer?

(1) x is the square of an integer.
(2) x is the cube of an integer.

Statement 1 indicates that x is a perfect square:
1, 4, 9, 16, 25, 36, 49, 64...
Statement 2 indicates that x is a perfect cube:
1, 8, 27, 64...
When the statements are combined, x must be equal to a value contained in both lists.
Thus:
It's possible that x=1.
It's possible that x=64.
Since the answer to the question stem is NO in the first case but YES in the second case, the two statements combined are INSUFFICIENT.

The correct answer is E.