for example 9 it is a square number beacause 3 multiplied by itself equals 9 and 3 by 3 in an array makes a square not a rectangle
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square numbers
They are called square numbers.
Square numbers * * * * * Although "perfect square numbers" is more descriptive.
Square numbers are the result of squaring an integer. Squaring means multiplying a number by itself, and this, in turn, is called thus because of the way the area of a square is calculated.
They are called perfect squares.