This question cannot be answered sensibly. A cubic metre is a measure of volume, with dimensions [L3]. A kilogram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a cubic metre of air and of water. They will have very different masses.
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Approx 2710 kg per cubic metre.
They are the same.
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
It is to different things. A meter is a measurment of length and kilogram is measuring weight
The answer depends on the size of the cube.