【Answer】17
【Solution】Just draw the figure. There are 3 of $28 \times 28$, 1 of $26 \times 26$, and 13 of $2 \times 2$, totaling 17.
16. From a rectangular sheet of paper measuring 82 cm in length and 28 cm in width, cut out a square with the largest possible side length. If the remaining part is not a square, then cut out another square with the largest possible side length from the remaining sheet. Repeat this process continuously. The number of squares finally cut out is $\qquad$.