The numbers "3" and "4" are whole numbers that follow "2" and precede "5" in the number line. They are commonly used in counting and basic arithmetic. In mathematics, "3" is considered a prime number, while "4" is a composite number because it can be divided by numbers other than one and itself. In various cultures, the number "3" often symbolizes harmony and balance, while "4" can represent stability and order. For example, in geometry, a triangle has three sides, and a square has four sides. These numbers are foundational in many aspects of life, including music, art, and science.