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a square is 2 dimensional and a cube is 3 dimensional
To calculate the volume of a cube, you use the third power of the length, so for example, if the length of an edge of a cube is 3" then the volume is 3x3x3 = 27 cubic inches. As a result, any time a number is raised to the third power, we can call it cubed, much as raising it to the second power is that number squared.
42 is not a cube number.
It is 1/2*1/3 = 1/6
It is called a perfect cube.