Program to check given number is prime or not using function in java.

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 import java.util.*;

public class function{

    public static void checkPrimeNumber(int n){

        int i;

        if(n==1){

        System.out.print("number is not prime.");  

        return ;

        }

        for( i=2; i<n; i++){

            if(n%i==0){

                System.out.print("number is not prime.");

                break;

            }

        }

        if(n==i)

        System.out.print("number is prime.");

        return;

    }

    public static void main(String[] args){

        Scanner sc=new Scanner(System.in);

        System.out.print("enter a number=");

        int n=sc.nextInt();

        checkPrimeNumber(n);

    }

}

■》Output->

enter a number= 7

number is prime.

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