A perfect square.
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A perfect square is a number whose square root is a whole number, such as 1, 4, 9, 16, 25, etc.
If the square root is a whole number, then the square of the square root, the original number, is also a whole number; all whole numbers can be expressed as themselves over 1, and so are rational numbers. The answer is thus any square number, ie the square of the natural numbers: 1 (1²), 4 (2²), 9 (3²), 16 (4²), etc.
* Its square root is a whole #. Example: 16 is a perfect square. Its square root is 4. 17 is not a perfect square. Its square root is around 4.123105626
3 and 84.
No.A perfect square is a number whose square root is a whole number, like 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, etc.