Learning how to work with a prime number in Java is a fundamental exercise for anyone starting their programming journey. A prime number is one that is divisible only by 1 and itself, making it a key concept in number theory and coding practices. This guide provides a clear and practical Java program to check whether a given number is prime or not. The step-by-step explanation helps beginners understand logic building, loop usage, and conditional statements in Java. By practicing this example, you not only strengthen your problem-solving skills but also prepare for common coding interview questions where prime number logic is frequently asked. The tutorial is simple, precise, and perfect for students and professionals looking to enhance their Java basics.