This question cannot be answered sensibly. A km (kilometre) is a measure of distance, with dimensions [L]. A gram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
600g
600g = 21.2oz
600g = 1.32277 lbs
usually around 800 grams
About 1.323 pounds to 600g
That is approximately 2.7 cups.
600g = 1.3 (1.32277) pounds.
600 grams = 21.16 ounces
5 kg is greater (it is equal to 5000g)
0.6kg = 600g
It depends on the liquid. At room temperature and sea level 600ml of water weighs 600g. 600g is 1.3lbs. If your 600ml is denser than water then it'll be more, if it's less dense it'll be less.
Still 600g unless you take it more than once. If you take 600g once a year in 10 years time it will be 6000g aka 6kg. I have a feeling you missed adding something to the question.