1. The problem is to understand the number 25 and its properties. 2. 25 is a perfect square number because it can be expressed as $5^2$. 3. The formula for a perfect square is $n^2$, where $n$ is an integer. 4. Here, $25 = 5^2$, so 25 is the square of 5. 5. This means 25 is the product of 5 multiplied by itself: $5 \times 5 = 25$. 6. Understanding perfect squares helps in simplifying square roots and solving quadratic equations. Final answer: 25 is a perfect square, specifically $5^2$.