No. 1, 5, 7 and 35 are not.
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1, 5, 7, 35
All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.
Yes.
Square numbers have an odd number of factors.
odd and prime are two different things ,but odd numbers can be prime or composite just depends if you can multiply it with another number except 1 here's an example 7 ( 7 is odd and is prime because it has 2 factors "7 & 1" 15 is odd ,but not prime because 5x3 is 15 and 15x1 is 15 5 and 3 are factors of 15 so all odd numbers are not prime all even numbers are composite except the number 2.