Is its area.
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The size of that area is known as the "area" of the figure.
A square number is a number that results from multiplying an integer by itself. In this case, 8 multiplied by 8 equals 64, making it a square number. The name "square" comes from the fact that if you were to draw a square with sides of length 8 units, the area of that square would be 64 square units, hence the term "square number."
48 of them.
Consider a 4 x 4 square. The perimeter is 16 units. The area is 16 square units. The whole number is the same, but the units are not.