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The real answer is 81
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.
No it is not a square number but it is very close to the square number 121.
No it is not a square number. It's square root is 18.57 rounded.