Yes.
1 km3 = 1km x 1km x 1km
= 100 000cm x 100 000cm x 100 000cm
= 105cm x 105cm x 105cm
= 1015cm3
1 liter = 1000cm3
= 103cm3
so 1015cm3 = 1015 / 103 liters
= 1012 liters
= 1 trillion liters
That is on the short scale; on the long scale 1012 is (106)2 = billion, so
1 km3 = 1 billion litres.
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