there hasn't been a perfect speech because speech offers a lifetime challenge in which there is never a final summit of achievement beyond which one cannot climb
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the answer is definitly 0 (zero)!
8 is a perfect cube; it is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer....you're thinking of 9...
30 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
500 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
1764 was a perfect square year.