The number "4" is a whole number that comes after "3" and before "5." It is often associated with stability and balance, as seen in the four corners of a square. In many cultures, the number 4 represents foundations, like the four seasons of the year: spring, summer, autumn, and winter. In mathematics, "4" is an even number and can be divided by 2 without leaving a remainder. It is also the first composite number, meaning it can be formed by multiplying two smaller whole numbers, specifically 2 x 2. This makes "4" an essential building block in various mathematical concepts.