This is not a valid conversion. Square mm is a measure of area. Cubic mm is a measure of volume.
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10 mm
100
10 mm = 1 cm, therefore 10 mm x10 mm x10 mm= 1 cm x 1 cm x 1 cm 1 cm3= 1000 mm3
1m = 1000 mm 1 m3 = 1m x 1m x 1m = 1000 mm x 1000 mm x 1000 mm = 1,000,000,000 mm3
(1 metre) squared = (1000 mm) squared = 1000000 mm squared.