C Program - Check Prime Number By Creating a Function

#include <stdio.h>

int isPrime(int num) {
    if (num <= 1)
        return 0;
    for(int i = 2; i < num; i++) {
        if(num % i == 0)
            return 0;
    }
    return 1;
}

int main() {
    int number;
    printf("Enter a number: ");
    scanf("%d", &number);

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

    return 0;
}

Enter a number: 17
17 is a prime number.

Check Prime (Function)