You can't convert that - it just doesn't make sense. Millimeters are used to measure length; quarts are used to measure volume.
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um...NONE
One millimeter is 0.000001km
There are 1,000 micrometers in one millimeter.
1 kilometer = 1000000 millimeter
1 micrometer = .001 millimeter 1000 micrometers in one millimeter (mm) = 10^-3 (um) = 10^-6