Use words, pictures, or numbers to describe how you can remember what "perfect square" means.

Step 1 ：A perfect square is a number that can be expressed as the product of an integer with itself. For example, \(4\) is a perfect square because it can be expressed as \(2*2\). Similarly, \(9\) is a perfect square because it can be expressed as \(3*3\).

Step 2 ：To remember what 'perfect square' means, you can think of it as a square with sides of equal length. For example, a square with sides of length \(2\) has an area of \(4\), which is a perfect square. Similarly, a square with sides of length \(3\) has an area of \(9\), which is also a perfect square.

Step 3 ：The method to identify whether a number is a perfect square or not involves taking the square root of the number, converting it to an integer (which effectively rounds it down), squaring it again, and then checking if the result is equal to the original number. If it is, then the number is a perfect square. If it's not, then the number is not a perfect square.

Step 4 ：\(\boxed{\text{Final Answer: A perfect square is a number that can be expressed as the product of an integer with itself. To remember this, you can think of it as a square with sides of equal length. The area of such a square (which is the product of its side length with itself) is a perfect square.}}\)