What is a composite, prime, and co-prime number ?

1.	What is a composite, prime, and co-prime number ?
Answer» Composite Numbers -A composite number is a positive integer that has a factor other than 1 and itself. For instance, 12 is a composite number because it is a positive integer and it has factors other than 1 and itself. 2, 3, 4, 6 are its factors other than 1 and itself. All even numbers greater than 2 are composite numbers. 2 is a prime number. The smallest composite number is 4.Prime numbers:Numbers which have only two factors 1 and the number itself are called prime numbers.E.g 2 ,3 ,5, 7 ,11 ,13, 17 and so on are all prime numbers.Of the first 100 numbers 25 are prime numbers.Only 2 is an even prime number all prime numbers are odd.Co prime numbers:Numbers which do not have any common factor between them other than one are called coprime numbers.Two natural numbers( not necessarily Prime) are coprime if their HCF is 1.For e.g\xa0(1,2) , (1,3), (3,4), (3,10), (3,8), (5,6), (17,23)even two composite numbers can also be Prime. for e.g(16,25), (84,65)

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