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There are 10.
The smallest prime number between 0 and 30 is 2, and the largest is 29.
30 and 135 are composite numbers. 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 factors of 30 that are not prime numbers are 6, 10 and 30.
There are infinitely many prime numbers which are greater than 30.