# Write a C++ Program to Check a number is Prime or not

**Check a number is Prime or not**

**Check a number is Prime or not**

Write a C++ Program to Check given number is Prime number or not. Here’s simple C++ Program to Check given number is Prime number or not in C++ Programming Language.

A **prime number** is a natural number greater than 1 that has no positive divisors other than 1 and itself. It means a prime number is only divisible by 1 and itself, and it start from 2. The smallest prime number is 2

Here is source code of the C++ Program to Check given number is Prime number or not. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ Program to Check given number is Prime number or not */ #include<iostream> using namespace std; int main() { int i,n; cout<<"Enter any positive number :: "; cin>>n; if(n==1) { cout<<"\nSmallest prime number is :: 2"; } for(i=2;i<n;i++) { if(n%i==0) { cout<<"\nThe Entered Number [ "<<n<<" ] is NOT a prime number.\n"; break; } } if(n==i) { cout<<"\nThe Entered Number [ "<<n<<" ] is a prime number.\n"; } return 0; }

**Output : :**

**Output : :**

/* C++ Program to Check given number is Prime number or not */ Enter any positive number :: 97 The Entered Number [ 97 ] is a prime number. Process returned 0

Above is the source code for C++ Program to Check given number is Prime number or not which is successfully compiled and run on Windows System.The Output of the program is shown above .

If you found any error or any queries related to the above program or any questions or reviews , you wanna to ask from us ,you may * Contact Us* through our contact Page or you can also comment below in the comment section.We will try our best to reach up to you in short interval.

**Thanks for reading the post….**

if i=10 and n=10 i,e n=i, is n(10)prime?

but it’s not possible,Since we create a condition ::

`if(n%i==0)`

then break;

In case of n=10,

when i=2, then 10%2==0condition satisfied and it breaks out of loop and i remains 2. So, i did not reach 10 in case n=10 andif(n==i) not satisfied, So it is not prime number. Hope u got it……Thanks for commenting