1. Odd numbers: numbers which are not multiples of 2 are called odd numbers.
Examples: 1, 3, 5, 7, 9, 11, 13, 17, 19, …. Are all odd numbers.
Even numbers: all multiples of 2 are called even numbers.
Examples: 2, 4, 6, 8, 10 … are all even numbers
Prime numbers: a natural number greaterthan 1 , which has exactly 2 factors, namely
1 and itself , is called a prime number.
Examples: 2, 3, 5, 7, 11, 13, 17, 19, … are all prime numbers.
Composite numbers: a natural number at least one factor, besides 1 and itself, is called
a composite number.
Examples: 4, 6, 8, 9, 10, …. Are composite numbers.
