There can be no equivalence.
A decimetre is a measure of length in 1-dimensional space while a square millimetre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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how much is one decimeter?
15.5 sq inch = 1 sq decimeter
You can't convert that.
1 decimeter is 10 centimeters or 100 millimeters. 1 millimeter is 0.01 decimeters.
1000 decimeter = 1/10 centimeter = 1/100 milimeter = 1/1000