1 is an exact divisor of all the numbers. Also, any number is divisible by itself.
Therefore, 1 is a factor of every number and every number is a factor of itself.

A perfect number is a number for which the sum of all its factors is equal to twice the number.

For example, 6 is a perfect number since the sum of its factors 1, 2, 3 and 6 is 12 i.e. twice of 6.
Perfect numbers are also defined as those numbers that equal the sum of all their factors including 1 but excluding the number itself.
Taking the same example of 6: sum of its factors excluding the number itself i.e 6 = 1+2+3 = 6.

Every number is a multiple of itself .

$72=1\times 72$

     $=2\times 36$

     $=3\times 24$

     $=4\times 18$

     $=6\times 12$

     $=8\times 9$

Factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.

All the numbers in the option: 90, 91, 92, 93, 94, 95, 96 have more than 2 factors, hence they are all composite numbers.

Prime numbers have only two factors, 1 and the number itself.

1 is neither prime nor composite. 
2 is the only even prime number. 
9 and 39 have more than 2 factors, hence they are not prime numbers.
Considering all these, the correct option is 19, 13, 11, 7 and 3.

To check the divisibility of a number by 11, we find the difference between the sum of the digits at odd places (from the right) and the sum of the digits at even places (from the right) of the number. If the difference is 0 or a number divisible by 11, then the number is divisible by 11.
For 10000001,

Sum of digits at odd places = 1

Sum of digits at even places = 1

difference = 1 - 1 = 0

Hence, 10000001 is divisible by 11

For divisibility by 9 - if the sum of the digits of a number is divisible by 9, then the number is divisible by 9.
The sum of digits of 459756 is 36 which is divisible by 9.
Hence, 459756 is divisible by 9.

Composite numbers have more than 2 factors.
For example, factors of 4 are 1, 2 and 4.

Composite numbers are those numbers which are not prime numbers except 1. 1 is regarded as a unique number.
The largest 3 digit number is 999 and it is a composite number. (divisible by 3, 9 etc)