There are 1000 millimetres in one metre. There are 1000 metres in one kilometre. Therefore, one kilometre is equal to 1000 x 1000 = 1000000 millimetres.
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There are 1 million milimetres in a kilometre.
One Thousand Kilometer Make One Billion Millimeter.
100 centimetres in one metre. Cent is Latin for a hundred. (Centurian) 1000 millimetres in one metre. Milli is Latin for a thousand. (Millenium)
I'm guessing you mean what is the smaller measure for distance in the metric system. The system is millimetres, centimetres, metres then kilometres. There are 10 millimetres to a centimetre, 100 centimetres to a metre, and 1000 metres to a kilometre. (Note: the American spelling of metre is meter, so the measures would be millimeter, centimeter, meter, and kilometer).
Since there are 1000 millimeters in a meter (the prefix "milli-" means thousandth") and 1000 meters in a kiliometer (the prefix "kilo-" means "thousand"), there are 1000 x 1000 = 1,000,000 millimeters in a kilometer.