larger is the wrong word to use here as it would depend on density, kg is a unit of weight not size. 1kg is certainly greater than 1g assuming the two substances are the same. but it is wrong to use the word larger in this question.
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There are 1,000mg in 1g, and 1,000g in 1kg. So, there would 1,000,000mg in a kg (1,000x1,000).
1 gram or 1 cg
1 g = 0.001 kg
Here is the Metric Table of Weight 1000 mg = 1 g 1000 g = 1 kg 1000 kg = 1 tonne. Hence 1 kg > 1 g > 1 mg.
1G