Doubt regarding the answer on prepswift: is it prime?

GRE Quant Problem Solving
1

Question source : Prepswift : Is it Prime Quiz question no. 2:

How many factors does a prime number have?

The answer as per the quiz is 2. ( the number and 1)

However, shouldn’t the answer be 4 ( the number , 1 , -1 and negative of the number) ?
I feel the question should explicitly state positive factors in order to have the answer as 2.

2

Normally when ETS says “factors”, they mean positive factors (and if we are looking for negative factors as well, some indication to that effect would be given on a GregMAT+ question, such as “total”). That being said, we’ve explicitly mentioned that we are looking for positive factors.

3

Thank you. Please update the solution too.

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4

Done.