A prime number is a number that is only divisible by 1 and itself, with examples being 2 and 3. A composite number has more than two factors, such as 4 and 6. Co-prime numbers only have 1 as a common factor, so prime numbers such as 35 and 39 are also co-prime numbers since they only share 1 as a common factor.

1. MOHAMED NAVEED
VI-C

2.  WHAT IS A PRIME NUMBER ?
Number which have only two factors are
called prime number 1 and the number
itself.
Example
 2 = 2 & 1
 3 = 3 & 1

3.  WHAT IS A COMPOSITE NUMBER ?
The number which have more than two
factors are called composite number.
Example
 4=2,1,4
 6=1,2,3,6

4.  WHAT ARE CO-PRIME NUMBER ?
Two numbers that have only 1 as the
common factor are known as co-prime
number. All the prime are co-prime numbers
Example
 35 = 7x5x1
 39 = 3x13x1