80
64
Zero. I would not both er with regrouping.
1, 2, 4, 5, 8
The only factors of 2 are 1 and 2. The factors of a prime number are 1 and the number itself.
48 has ten factors.
97
88 does.
96
36 has nine factors.
28 is an example of a 2 digit composite number because it has more than two factors.
97
There are none but the smallest 3 digit number is 161
95
100
88
80