196. Composite Squares. Can you find two three-digit squares (with no zeros) that, when written consecutively, form a six-digit number which itself is a square? For example, from 324 and $900\left(18^{2}\right.$ and $\left.30^{2}\right)$ we get $324900\left(570^{2}\right)$, but the number 900 contains two zeros, which is prohibited by the condition.

The problem has only one solution.
196. The answer is the number 225625 (the squares of the numbers 15 and 25, written down one after the other), which equals the square of 475.