2025 = 45^2 so 2025 is a perfect square.
2025 is also the product of 2 perfect squares: 2025 = 25 * 81
If you add one to each digit you get 3136 which is also a perfect square (56^2)
2025 = 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3. (sum of the first 9 cubes)
2025 = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)^2