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A cube, or any other rectangular prism
A rectangular prism, or, since any rectangle is also a square, a cube.
A brick, book, dresser or shelf, a toy chest or a rectangular box.
If it's a squarish object, you multiply the length by the height by the depth. If it's not a rectangular prism, you'll have to be more specific, because there are a lot of different formulae for different shapes.If you don't know what shape it is, you can put the object in water and see how much it displaces.
A rectangular prism has a volume that can be found by multiplying the object's length width and height. To obtain the mass one must also know the density of the object and multiply that by the volume.