Prime & composite numbers: We can divide almost all numbers into two categories: prime numbers and composite numbers.

Prime Number: A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Example: 3, 5, 7, 11, 13, 17, 19 etc;

Composite Number: A composite number is a positive integer that has at least one positive divisor other than one or the number itself.

Example: 4, 6, 8, 9, 10 etc;