This question is not dimensionally consistent, and so cannot be answered.
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A kilometer is a unit of length, not of mass. So, it is impossible for something to "weigh a kilometer".
One kilometer is 1000 meters, so a kilometer is bigger.
One meter is 1/1000 of a kilometer.
No, it's the other way around. A meter is one-thousandth of a kilometer, and kilometer is a thousand meters.
A kilometer is much bigger. It takes 1,093.6 yards to equal one kilometer.