If the least prime factor of a number is and the least prime factor of another number is then the least prime factor of the number is :
Least prime factor of a number is
and the least prime factor of another number is 7
Case 1: Let, any number whose least prime factor is .
A number will be always odd whose least factor is .
Therefore, always be odd.
Case 2: Let, any number whose least prime factor is .
A number will be always odd whose least factor is .
Therefore, always be odd.
Hence, the correct answer is option A.