Java Program to check whether a Number is Prime or Not1 min read

In this tutorial, we will write a program to check whether the number is prime or not in java. Before that, you should have knowledge on the following topic in java.

Prime Number

A number is said to be a prime number if it is divisible by itself and 1. Example: 3, 5, 7, 11, 13, 17, 19, etc.


Explanation:
We take a boolean variable isPrime and assigned it to be true. Then we take the user input and start a for loop for i = 2 end the loop for i less than half of the number entered. i will increase by 1 after each iteration.

Inside for loop, a temp variable will contain the remainder of each iteration. And then if statement will check for temp to be 0 that is if the remainder is zero, isPrime is set to false. If isPrime is true, the number is Prime number else not.


Java Program to check whether a Number is Prime or Not

source code: Java Program to check for the prime number.

Output:

Enter any number: 13
13 is a Prime Number


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