So, what type of number is 4? It’s a composite number! It has more than two factors, which makes it part of the composite number family. But that’s not all. The number 4 also belongs to other interesting classes of numbers:

• Even Number: 4 is an even number because it can be divided by 2 without leaving a remainder. Any number ending in 0, 2, 4, 6, or 8 is considered even.

• Square Number: 4 is a square number because it’s the result of multiplying a number by itself. In this case, 2 x 2 = 4. Other examples of square numbers are 1 (1 x 1), 9 (3 x 3), and 16 (4 x 4).

• Perfect Square: This is similar to a square number. A perfect square is a number that can be expressed as the product of an integer with itself. So, 4 is a perfect square because it is 2 squared (2^2).

• Real Number: 4 is a real number, which means it’s a value that represents a quantity along a continuous line. All rational and irrational numbers are real numbers.

• Natural Number: 4 is a natural number because it’s a positive integer. Natural numbers are used for counting (1, 2, 3, 4, …).

• Whole Number: 4 is also a whole number, which includes all natural numbers and the number 0.

By being part of these different classes, 4 shows just how versatile and interesting numbers can be!

Is 4 a Semiprime Number?

A semiprime number is a number that is the product of exactly two prime numbers. For example, 6 is a semiprime because it’s 2 x 3. By this definition, 4 is actually a semiprime number because it is the product of the prime number 2 multiplied by itself (2 x 2). So yes, 4 is a semiprime!