No, a cube is not a number. A number "cubed" expresses a number times itself three times. For example: 3 cubed = 3 x 3 x 3 = 27 In other words, when the exponent on a number is three, the number is cubed.
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42 is not a cube number.
It is called a perfect cube.
a perfect cube
No. (The closest cube number is 64 = 43.)
It is the cube of a prime number.