Question

What is square of a number?​

Answer 1

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In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals 3^2 and can be written as 3 × 3. 

Answer 2

Square of a number means multiplying that number by itself.