There is no equivalence.
A millimetre is a measure of length or distance in 1-dimensional space while a square metre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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315 meters squared = 3,391 in feet squared.
From "Fluid Mechanics" by Streeter & Wylie (c) 1979 .3048m = 1 ft so... .3048 squared meters squared = 1 squared ft squared or... .0929 meters squared = 1 ft squared or... 1 ft squared /.0929 meters squared = 10.7639 ft squared/ meters squared so... 30 m2 times 10.7639 ft2/m2 = 322.9173 meters squared Answer: 322.9173 meters squared
2.56 square meters
86.12 square meters.
They mean the same thing. Square meters is the same as meters squared.