# How to check a number is a prime number or not in java.

**Solution:-** A prime no can not be divided by any other number it is divided by itself. if another no divide this prime no then is given result x.123 etc. And if a number is a divide by any other no give the result 0 then the number never a prime number.

// prime no whose no that are divide by it self other no can not divide a prime no class PrimeNoExample { public static void main(String… s) { int a=0; int b; int temp=0; int n=11; a=n/2; if(n==0||n==1) { // this condition check if no 0 and 1 then it is not a prime no System.out.println(n+" is not Prime number"); } else { // in the else condtion we can start loop from 2 because in if condition we have already define 0 and 1 is not prime no for(int i=2;i<a;i++) { if(n%i==0) { // if no divided i value i mean (2,3,4……) and after divide the value is 0 then is it not a prime no System.out.println(n+" is not Prime number"); temp=1; break; } } } if(temp==0) // this condition check if upper loop divide and no and give the result 0 then the no never a prime no and this conditon con not means the number is prime no { System.out.println(n+" is Prime number"); } } }

Copy this above code and paste a notepad file and save it “**PrimeNoExample.java**” file then compile and run.

Output:-11 is Prime number.