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'997' is the 168th smallest prime number.
The prime numbers between 0 and 10 are:2, 3, 5, 7.
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. The largest prime number between 18 and 24 is 23.
1 is a prime number, but 0 is neither a prime number nor a composite number.