1. The problem is to understand the number 4 and its properties. 2. Number 4 is a positive integer and an even number. 3. It is the square of 2, since $4 = 2^2$. 4. It is also the sum of the first two positive even numbers: $2 + 2 = 4$. 5. In algebra, 4 can be used as a constant or coefficient in expressions and equations. 6. For example, in the equation $4x = 8$, solving for $x$ gives $x = \frac{8}{4} = 2$. 7. Understanding the properties of numbers like 4 helps in solving various math problems.