Integers

Integers are the set of whole numbers and their opposites (negative whole numbers), including zero. They do not include fractions, decimals, or any number that has a fractional part. The set of integers is often denoted by the symbol Z. Formally, the set of integers is:
{Z} = …… -3, -2, -1, 0, 1, 2, 3, ……

Real Numbers

Real Numbers: Real numbers include all rational and irrational numbers. They can be represented on the number line and include integers, fractions, decimals, and irrational numbers like √2 or π. Real numbers can be positive, negative, or zero.

Composite Numbers

Composite numbers are positive integers greater than 1 that have at least one positive divisor other than 1 and itself. In other words, a composite number has factors in addition to 1 and the number itself. This means that composite numbers can be divided evenly by numbers other than 1 and themselves. Examples of composite numbers include 4, 6, 8, 9, 10, etc.

• For instance, 4 is composite because it has divisors 1, 2, and 4.
• 6 is composite because it has divisors 1, 2, 3, and 6.

Note that the number 1 is neither composite nor prime, and the number 2 is the smallest and the only even prime number.