To find a composite number, think of two numbers that can be multiplied to equal that number. For example, 15 is a composite number because its factors are 1, 3, 5 and 15. For a number to be composite, it should have more than two factors.
To know 15 is a composite number, know:
1 x 15=15
3 x 5 =15
All composite numbers have more than two factors whereas prime numbers have only two factors.
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One needs the composite number before he can find its factors. Thus the solution I shall give is ∞.
A number is prime when it only has one and itself as factors is prime. Therefore, to tell if a number is prime or composite simply find it's factors. If it has more than two factors than it is not a prime number, it is composite.
It is a composite number.
It is a composite number.
It is a composite number.