None, everything is either prime or composite.
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1 is the counting number that is neither a prime number nor a composite number.
The number 1.
A composite number.
Composite.
15 is a composite number because it has more than two factors. Its factors are 1, 3, 5, and 15.15 is a composite number as it is divisible by 1, 3, 5 and 15.composite. 3*5=1515 is a composite number because it has more than 2 factors