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81 is; Natural number, Perfect-square number, Perfect 4th root number, Perfect totient number, Odd Number, Composite Number, etc.
A number has only two square roots. The two sqrts of 24 are 4.898979 and -4.898979 (to 6 dp)
Well, let's paint a happy little picture here. The 4th square number is 16 (4 squared), and the 3rd cube number is 27 (3 cubed). If we add them together, we get 43. Isn't that just a lovely sum? Just like adding a touch of bright color to a beautiful landscape.
A perfect square is a rational number equal to the square of a whole number.
The square root is the number which is times by itself, to get the square number.