Prime Number Check
Determines if a given number is prime. Optimized solution checking up to square root.
#include <iostream>
using namespace std;
int main() {
cout << "INSTRUCTIONS: Enter a number to check if it is prime." << endl;
int n;
cin >> n;
if (n <= 1) {
cout << "Not Prime";
return 0;
}
for (int i = 2; i * i <= n; i++) {
if (n % i == 0) {
cout << "Not Prime";
return 0;
}
}
cout << "Prime";
return 0;
}Prime Number Check — Free C++, C, Python Code Example
Determines if a given number is prime. Optimized solution checking up to square root. This free code example is available in C++, C, Python and can be copied and run immediately — no account or signup required. Use the language tabs above to switch between implementations.
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Frequently Asked Questions
What does this program do?
Determines if a given number is prime. Optimized solution checking up to square root.
Which languages is it available in?
Available in C++, C, Python. Switch between implementations using the tabs at the top of the code viewer.
How do I run this code?
Copy the code, save it with the right file extension (.c, .java, .cpp, or .py), then compile or run it with your installed compiler or interpreter (GCC, JDK, G++, Python 3).
Is this code free?
Yes — free to view, copy, and use. No account required.