Smallest prime number is ____.

Q.

A number $a$ has 3 as its smallest prime factor, and another number $b$ has 5 as its smallest prime factor. What is the smallest prime factor of the number $a+b$?

Q.

A number $a$ has 7 as its smallest prime factor, and another number $b$ has 3 as its smallest prime factor. What is the smallest prime factor of the number $a-b$?

Q. Prove that the sum of third smallest prime number and third smallest composite number is a prime number.

Q. What is the smallest odd prime? Is every odd number a prime number? If not, give an example of an odd number which is not prime.

Q. The product of any natural number and the smallest prime is
(a) an even number
(b) an odd number
(c) a prime number
(d) None of these