No, they are the same factor since each is a multiple (-1 times) the other.
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A non-factor.
A factor or a divisor.
In one sense, the opposite of the GCF could be the least common factor, but the least common factor of any set of positive integers is 1, so it's not very interesting.
The opposite of a common factor is a prime factor. Common factors are numbers that evenly divide two or more integers, while prime factors are numbers that are only divisible by 1 and themselves. The prime factors of a number are the building blocks that make up that number, and they cannot be further broken down into smaller factors.
a proper factor is a factor.