The question, as stated, cannot be answered sensibly. A square centimetre is a measure of area, with dimensions [L2]. A gram is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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1 m = 100 cm so 1 sq m = 1 m * 1 m = 100 cm * 100 cm = 10,000 sq cm. Multiply the gms/sqcm figure by 10,000 to get gms/sq metre.
100 sq mm = 1 sq cm
150 sq cm is an area NOT a volume. You cannot convert an area into a volume.
The answer will depend on what you wish to convert it to.
1 sq. cm = 100 sq. mm.