They're talking about prime factors, not that it changes much.

The site also lists the factors and beside 1,2 and 1966 they are all wrong.

Google harvests its result from the same page

> The factors of 1966 are 1, 2, 3, 6, 11, 17, 22, 33, 34, 51, 66, 102, 187, 374, 589, 1178, and 1966. These are the whole numbers that divide 1966 evenly, leaving no remainder.