There are 36 1x1 squares. There are 25 2x2 squares. There are 16 3x3 squares. There are 9 4x4 squares. There are 4 5x5 squares. There is 1 6x6 squares. That's a total of 36+25+16+9+4+1=91 squares. It's interesting that those numbers are the perfect squares , , , , , Edwin