C Program to Check Whether a Number is Prime or Not.

2 ) //C Program to Check Whether a Number is Prime or Not

#include <stdio.h>

#include <stdbool.h>

bool isPrime(int number) {

    if (number <= 1) {

        return false; // 0 and 1 are not prime numbers

    }

    for (int i = 2; i * i <= number; i++) {

        if (number % i == 0) {

            return false; // If the number is divisible by any integer from 2 to sqrt(number), it's not prime.

        }

    }

    return true; // If no divisors were found, the number is prime.

}

int main() {

    int num;

    printf("Enter a number: ");

    scanf("%d", &num);

    if (isPrime(num)) {

        printf("%d is a prime number.\n", num);

    } else {

        printf("%d is not a prime number.\n", num);

    }

    return 0;

}