Prime Number Checker

This is a simple Python script that takes a list of numbers from user input, detects prime numbers, and prints which ones are prime.

🔧 Features

• Accepts input in various formats: numbers separated by spaces, commas, or dots
• Automatically filters non-integer input and handles errors
• Efficient prime number detection using square root optimization

📥 Input Format

When prompted, enter numbers like:

4, 7, 10, 18

Any combination of commas, dots, or spaces will be parsed correctly.

✅ Example Output

write numbers: 3, 4, 5
3 is prime
4 is not prime
5 is prime
Prime numbers: [3, 5]

💡 How it works

• The input string is cleaned using replace(',', ' ').replace('.', ' ').
• The cleaned string is split and converted into integers using list comprehension.
• Each number is checked for primality by trying to divide it by all integers from 2 up to the square root of the number.
• Results are printed and prime numbers are stored in a list.

🧠 Requirements

• Python 3.x

🤝 License

MIT License – free to use and modify.