1 light year = 9.46 × 1018 millimetres
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1,219.2 millimeters
7,000,000 millimeters
914.4 millimeters
1 light year = 9.4605284 × 1015 meters
If you mean to say "How many millimeters in an inch?" (Millimeters, not mileometers) then the answer would be 1 inch is 25.4 millimeters.