Q: What is the biggest odd composite number?

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No, if you think that you have it, you can always find one that is larger. Take, for example you find an even composite number (all even numbers, except 2 - which is the only even prime, are composite). Call this number N. Now add 2 to N for N+2, which is also even, so it is also a composite. What about odd composites: if you find an odd composite(M), then add 1 to it: odd+odd=even, so M+1 is even, which is also composite. You can keep going forever.

21 is an odd composite number

81 is an odd composite number.

A composite odd number

You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.

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No, if you think that you have it, you can always find one that is larger. Take, for example you find an even composite number (all even numbers, except 2 - which is the only even prime, are composite). Call this number N. Now add 2 to N for N+2, which is also even, so it is also a composite. What about odd composites: if you find an odd composite(M), then add 1 to it: odd+odd=even, so M+1 is even, which is also composite. You can keep going forever.

21 is an odd composite number

35 is an odd composite number

Yes

It is a composite odd number

It is impossible to list the infinite number of composite odd numbers.

81 is an odd composite number.

19 is the tenth odd number, And is not a composite number or even number.

29 is odd and prime.

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