Question 13
In a 4-digit perfect square, the first two digits are the same, and the last two digits are also the same. What is the value of this 4-digit number?
**Editorial note for this self-study exercise:** The form is aabb with a in 1–9 and b in 0–9; equality between a and b is not required or excluded. Enter the four-digit number.
**Editorial note for this self-study exercise:** The form is aabb with a in 1–9 and b in 0–9; equality between a and b is not required or excluded. Enter the four-digit number.