A composite number is defined as a "positive integer with a positive divisor other than one and itself". So therefore, while negative numbers can have factors in the same way as positive numbers, none is considered prime.
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Negative numbers can be classified as either prime or composite because they still have their absolute value
The number 1 is neither prime nor composite.
Not all composite numbers are even, but all even numbers except 2 are composite.
The number of composite numbers is infinite.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. -2 is composite.