15 is one.
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All odd numbers have odd factors.
Because 55 is an odd number. All the factors of odd numbers are odd.
Yes. Square numbers have an odd number of factors. 49 has three factors.
Even powers of prime numbers. Square numbers have an odd number of factors.
If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.