1. **State the problem:** We need to find the perimeter of a square where each side measures 16 inches. 2. **Formula for perimeter of a square:** The perimeter $P$ of a square is given by the formula: $$P = 4 \times \text{side length}$$ 3. **Apply the formula:** Since each side is 16 inches, substitute this value into the formula: $$P = 4 \times 16$$ 4. **Calculate:** $$P = 64$$ 5. **Conclusion:** The perimeter of the square is 64 inches.