15 is a composite number.
11 is a Prime number.
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composite because 3 and 5 will go into it
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.
It is 11.
15 is composite number 17, 19 and 23 are prime numbers.
It's a Prime number