Create a Prime Number Checker using HTML CSS and JavaScript.

The student's programming assignment.

Title: Prime Number Checker
Description: This program is a simple web application that allows users to check whether a given number is prime or not. It is designed with a clean and user-friendly interface. The user inputs a number into the provided input field, and upon input, the program dynamically evaluates and displays whether the entered number is prime or not.
Features:
1. User-Friendly Interface:
o The web page has a visually appealing design with a linear gradient background, providing a modern and pleasant user experience.
2. Input Validation:
o The program checks if the user-entered value is a valid number. If an invalid entry is detected (non-numeric input), a message is displayed, prompting the user to enter a valid number.
3. Prime Number Checking:
o The core functionality is implemented through a JavaScript function named isPrime. This function determines whether a given number is prime or not by checking for divisors up to the square root of the number.
4. Real-Time Result Updates:
o As the user types a number into the input field, the result is dynamically updated in real-time. The result is displayed below the input field, indicating whether the entered number is prime or not.
5. Styling and Animation:
o The program utilizes Cascading Style Sheets (CSS) to enhance the visual appeal. Styling includes gradient backgrounds, rounded corners, and subtle hover effects. The container has a smooth transformation effect on hover, providing a responsive and engaging interface.
Usage Instructions:
1. Open the HTML file in a web browser.
2. Enter a positive integer greater than or equal to 1 into the input field.
3. The result will be displayed instantly, indicating whether the entered number is prime or not.
This program serves as a practical introduction to web development concepts, including HTML for structure, CSS for styling, and JavaScript for dynamic functionality. It also provides hands-on experience with user input validation and real-time result updates. Students can further customize and extend this program as part of their learning process.

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