Prime Number: A natural number (i.e. 1, 2, 3, 4, 5, 6, etc.) is called a prime or a prime number if it has exactly two positive divisors, 1 and the number itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is a prime because only 1 and 5 evenly divide it, whereas 6 is composite because it has the divisors 2 and 3 in addition to 1 and 6. The fundamental theorem of arithmetic establishes the central role of primes in number theory: any integer greater than 1 can be expressed as a product of primes that is unique up to ordering. The uniqueness in this theorem requires excluding 1 as a prime because one can include arbitrarily many instances of 1 in any factorization, e.g., 3, 1 × 3, 1 × 1 × 3, etc. are all valid factorizations of 3.

To understand above logic simply choose a as 5 and b as 8 and then do what is written in program. You can choose any other combination of numbers as well. Sometimes it's a good way to understand a program.

To understand above logic simply choose a as 5 and b as 8 and then do what is written in program. You can choose any other combination of numbers as well. Sometimes it's a good way to understand a program.
VB Script program will be as shown:-
Out Put Of the Above Program
Example for Prime
Example for Not Prime