they are called numbers with 3 factors
None because prime numbers have only two factors
Factors don't have numbers. Numbers have factors. Numbers that have the factors 2, 4 and 8 are 8 and all of its multiples.
Because there are only four numbers that divide into those numbers evenly.
Numbers having only 2 factors are prime numbers. Their only factors are 1 and themselves. Prime numbers. The only two factors should be 1 and itself.
There are square numbers (numbers which are a square of an integer), such as 4. It's factors, listed are 1, 2, and 4. All square numbers have an odd number of factors. Then there's 1, which has only 1 factor: 1. All other numbers have an even number of factors. Prime numbers will have only 2 factors (2 is even).
1 has only 1 factor (1) 2 has only 2 factors (1 and 2) 3 has only 2 factors (1 and 3) 4 has only 3 factors (1, 2, and 4) 6 has 4 factors (1, 2, 3, and 6) 8 has 4 factors (1, 2, 4, and 8)
Prime numbers only have one and itself as factors.
Numbers that have only 2 factors are prime numbers
Prime numbers have only two factors, 1 and themselves, so only prime numbers could have only two factors
They are 5, 7 and 11 which are all prime numbers
What two numbers have the factors 2 4 and 8