Because it has more than two factors
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=153 x 5 =15All composite numbers have more than two factors whereas prime numbers have only two factors.
15 is a composite number. 11 is a prime number.
15 is composite.
2 is a prime number and 15 is a composite number.
15 is a composite. Its factors are 1, 3, 5, and 15.
composite because 3 and 5 will go into it
No, 13 is a prime number and 15 is a composite number. A composite number is a positive integer that has more than two positive divisors.
15 is a composite number
15 is a composite number - it is the product of 3 and 5. (3*5=15)
15 is composite.
A composite number is a positive integer that has at least one positive divisor other than one or itself. For example 4,6,8,9,10, 12, 14, 15, 16, 18, 20,21, 22...are composite numbers
The first 12 composite numbers are.... 4,6,8,9,10,12,14,15,16,18,20,21,A composite number is basically any number that can go into that number, so like 15 is a composite number because 15x1=15,and then 5x3=15. That's two or more pair of numbers.