6, 8 and 91 and three examples.
6, 8 and 10
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
Just 36.
60, 72, 84, 90, and 96 each have 12 factors.
Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.
196, 169, 144
Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
6 (1,2,3,6) 10 (1,2,5,10) and 15 (1,3,5,15).
4, 9, 25 and 49 They are squares of prime numbers.
11
Just 36.
14 (I think).
there are 3 no.2,3 & 5
1, 2, 3, 5, and 7
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
62, 65, 69
The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.