A cubic kilometer is a volume while a kilometer is a length. You can't convert one to the other.
Just remember that when you have a cubic kilometer it is volume the size of 1 km long, 1km wide and 1km high.
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A liter is a cube exactly one tenth of a meter (1 decimeter) on a side.
There are ten decimeters in a meter and so ten thousand of decimeters in a kilometer (1000 meters)
There are exactly: 10 000 * 10 000 * 10 000 = 1 000 000 000 000 liters in a cubic kilometer (1012)
(in the English language there are conflicting names for this number so I won't write the name in letters)