Not quite sure what a sq rm is but assuming it is somehow related to a square metre, this question cannot be answered in a sensible way. A square metre is a measure of area, with dimensions [L2]. A centimetre is a measure of length, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
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1 sq in = 6.452 sq cm
1 in = 2.54 cm (exactly) 1 sq in = 1 in x 1 in = 2.54 cm x 2.54 cm = 6.4516 sq cm ⇒ 4 sq in = 4 x 6.4516 sq cm = 25.8064 sq cm ≈ 25.81 sq cm
1 sq metre = 1 m x 1 m = 100 cm x 100 cm = 10000 sq cm.
A linear length of 1 cm has no width so its area is 1 x 0 = 0 sq cm
1 metre * 150 cm = 1.5 sq metres = 1.5*10.764 sq feet = 16.146 sq feet