How many actual stars are Polaris?
Polaris consists of multiple stars, 

α UMi Aa is the main star. It is a supergiant, and a cepheid variable. α UMi Ab and α UMi B are smaller (but still larger than the sun) and both are in orbit with α UMi Aa, (the former is close in, the latter is further out).

There are two further stars: α UMi C and D. These stars are thought to have formed before α UMi Aa, and so are not considered to be physically associated with α UMi A. There are other stars that appear nearby, one might be physically associated: J021006.2+891626 J021454.3+890852 are their catalogue numbuers. They are faint, but appear to be the same age as Polaris.

In conclusion, Polaris is known to have 3 stars: Aa, Ab and B. The stars C and D are not physically related to Polaris. There may be one or two more stars that are distant dwarfs and may share Polaris's orbit.

Reference http://iopscience.iop.org/article/10.1088/0004-6256/139/5/1968