You are finding the square of a number (E.g: 5^2 = 5 * 5 = 25).
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Multiplying 0.6 by itself will yield 0.36
You square numbers by multiplying the number by itself.
A composite number.
Cubing a number does not mean multiplying it by 3 - it means multiplying it by itself, and then multiplying it by itself again. For example, 9 cubed is equal to 9 x 9 x 9 = 729.
No, 21 is not a square number. A square number is the result of multiplying an integer by itself, and 21 cannot be expressed as the square of an integer.