What the number can be multipled by
For a number to have common factors, there needs to be another number to compare its factors with.
Maybe that the factors of the number are also factors of the number's multiples?
Square numbers have an odd number of factors.
Acomposite number has more than two factors whereas a prime number has only two factors
If you are multiplying negative numbers, an odd number of factors will have a negative product. An even number of factors will have a positive product.
Yes, if they match the factors of another number.
They are factors of that number
One of its factors
every number has a limited amount of factors those you could chose any number and find another with that number of factors