Any product of two or more odd numbers that are larger than 1. For example, 33 = 3*11 is odd and composite.
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9, 15, 21, 25, 27
None. All counting numbers are even or odd.
All numbers are either odd or even, none are both, so less than 30 there are 29 counting numbers that are either odd or even but not both. (Assuming you mean starting to count with 1.)
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
composite numbers are those that have more than 2 factors. all even numbers other than 2 are composite numbers and some odd numbers are composite numbers. numbers that are prime are the numbers that are not composite numbers i hope this answers your question :)