The answer will depend on what shape "4 5 2" defines. Since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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Volume of cuboid: 5*4*2 = 40 cubic cm
4 x 5 x 2 = 40cm3
there are 5. 1-length/height 2-Width and length/height 3-length and height and volume 4-Space and length and height and volume 5-Time and Space and Length and width and volume
2 ÷ 4/5 = 5/2 or 21/2
You can't. The volume doesn't tell you the dimensions. There are an infinite number of combinations of dimensions that all have the same volume. If I have a rectangular solid and its volume is 60, its length, width, and height could be 1, 1, 60 1, 2, 30 1, 3, 20 1, 4, 15 1, 5, 12 1, 6, 10 2, 3, 10 2, 6, 5 3, 4, 5 . . etc. If I only tell you the volume, there's no way to know the dimensions.