What are looping statements. Write a program to check whether a number is prime no. or not.

Looping statements in programming languages are used to execute a block of code repeatedly based on a condition. There are three types of loops in programming:

1. For loop: It is used when we know the number of times we want to execute a block of code.
2. While loop: It is used when we want to execute a block of code until a specific condition is met.
3. Do-while loop: It is similar to the while loop but the difference is that it checks the condition after executing the block of code. So, the block of code will be executed at least once.

Now, let's write a program to check whether a number is prime or not. A prime number is a number that has only two factors: 1 and itself. So, if a number has more than two factors, it is not a prime number.

Here is a simple Python program to check if a number is prime or not:

def is_prime(n):
    if n <= 1:
        return False
    for i in range(2, n):
        if n % i == 0:
            return False
    return True

num = int(input("Enter a number: "))
if is_prime(num):
    print(num, "is a prime number.")
else:
    print(num, "is not a prime number.")

In this program, we define a function is_prime() that takes a number n as an argument. If n is less than or equal to 1, it returns False because 1 is not a prime number. Then it checks if n is divisible by any number from 2 to n-1. If n is divisible by any of these numbers, it returns False because n is not a prime number. If n is not divisible by any of these numbers, it returns True because n is a prime number. Then we take a number as input from the user and check if it is a prime number or not using the is_prime() function.