The question seems to mix units of mass (kilograms) with units of length (centimeters), which are not directly convertible. Kilograms measure weight, while centimeters measure distance. If you meant to ask about converting kilograms to grams, then 2 kg equals 2000 grams. If you have a specific object in mind, you would need its density to relate mass to volume or length.
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Cm is a unit of distance; kg is a unit of weight. They are incompatible. 0.5 kg = 50,000 cg
I think you meant 3.15 km, not kg. Kg is a unit of weight. Anyway, 3.15 km=315000 cm.
400 kg
2 km = 2*105 cm
Strangely enough, 2 centimetres is 2 cm.