That is one definition of the set of proper factors.
All factors except the number itself or unity are "proper factors", the excluded ones being tautological.
"Proper factors" are all of a number's factors except one and the number itself.
A prime numbers has no positive integer factors except itself and 1. The number 1 has only itself as a factor. The number 0 has no factors at all.
That is one definition of the set of proper factors.
Every number except the number 1 has at least two factors, 1 and the number itself. Prime numbers have exactly two factors and composite numbers have more than two factors. All even numbers except the number 2 are composite numbers and have more than two factors. The number 2 is prime and its only factors are 1 and 2.
All of them except 79 which is a prime number because it has only two factors which are itself and one
All the number except for 35 have only two factors: one and the number itself. 35 is the composite number.
A number is composite if it has factors apart from 1 and the number itself. Otherwise it is prime. All even numbers (except 2) are composite.
Abundant is a number for which the sum of all its proper factors is greater than the number itself. Deficient is a number for which the sum of all its proper factors is less than the number itself. Perfect is a number for which the sum of all its proper factors is the number itself.
A prime number is a number having exactly two factors, 1 and the number itself. All prime numbers except the number 2 are odd numbers.
All even numbers are composite except 2 itself which is a prime number because it has only two factors which are itself and one.
29 is a prime number, so it has only two factors 1 and itself. All the numbers except 1 and 29 are not the factors of 29.