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Density has dimensions of (mass) divided by (volume) = M L-3
All physical quantities are combinations of one or more of the dimensions of length, mass, time, and electric charge.
Length, mass, and time are the three fundamental dimensions on which the measurement of all physical quantities is dependent.
Whether in English or otherwise, you cannot have a mass of 4.7 cm by 4.5 cm. A square cm (cm times cm) is a measure of area, with dimensions [L2]. Mass has dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
This question cannot be answered sensibly. A kilogram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as from mass to length without additional information.