1 foot is 12 inches. A square foot would be 12 inches long and 12 inches wide... that would be 12X12. You do the math, I won't finish your homework for you.
There are no inches in 1 square foot.
A square foot is a measure of area. An inch is a measure of length. The two are incompatible.
However, there are 144 square inches in a square foot.