Properties of Square Numbers  1.  Square numbers from 1 to 20 in below table. Number   Square   Number   Square   1 1 11 121 2 4 12 144 3 9 13 169 4 16 14 196 5 25 15 225 6 36 16 256 7 49 17 289 8 64 18 324 9 81 19 361 10 […]