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.
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Many prime numbers and many composite numbers.
The largest single digit composite number is 9. The largest prime number is 17 million digits long. The definition of a composite number is any number that has at least one positive divisor other than one or the number itself (it is not a prime number). The largest composite digit is therefore longer than the largest prime number by at leaf +1.
97A 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. 97 is the largest 2 digit prime number.
97 and 4
The largest staircase comosite largest staircase composite is the number 2223 because 1 is not counted as a prime so the 1 digit prime is 2, the smalles 2 digit prime is 11 and smallest 3 digit prime is 101