Meters are an unit of distance, and milliliters (note spelling) are an unit of volume, so this is unanswerable.
600mg
1000
That is 0.002 pints.
.8
That is approximately 28.35
0.24
Only if you think of pure water you can say: 1 mililiter of water weighs 1 gram.
6000 ml
.001
That is 1,000 mg
1892.7 ml
They are not compatible.