If the question is how many millimetres in a litre, the answer is NONE. A millimetre is a measure of length (or distance) while a litre is a measure of volume. The two measure different things and it makes no sense to even think about converting from one to the other.
The prefix milli- means thousandth.
There are a thousand mill-anything in a whole.
1500 ml
2.2 mililiters = 0.0022 liters
6 liters
3 liters
26
.75
700
3000
3600
1500
10,213
5920ml
8000 milliliters = 8 liters