Prime Check: frequently asked questions
Straight answers to the questions people ask most about Prime Number Checker.
Is Prime Check really free?
Yes. There is no paywall, no trial, no watermark, and no usage cap. Open Prime Number Checker and use it as often as you like.
Does Prime Check upload my files?
No. Everything runs locally in your browser. Your math files never leave your device, so there is nothing to leak or delete later.
Do I need to install anything?
No installation, no plugins, no extensions. If you have a current browser, you already have everything you need.
Is there a limit on file size or how much I can do?
The tool accepts text and data inputs as needed and handles large files. There is no daily limit on how many jobs you can process.
Does Prime Check work on my phone?
Yes. The tool adapts to any screen, so it works on phones, tablets, laptops, and desktops.
Verdict
If you were unsure about prime number checker, now you know: free, private, unlimited, and cross-device. Start at Prime Number Checker.