Any non-zero natural number can be judged by at least one factor () and the total number can be divided by 2

Any non-zero natural number can be judged by at least one factor () and the total number can be divided by 2

Any nonzero natural number has at least two factors
1 has only one factor
All sums can be divided by 2 (wrong)
If 9 is a combined number, but it is an odd number