Test your knowledge of prime numbers by deciding whether each number shown is prime or not. Wrong guesses on composite numbers reveal the real factorization, and the number range grows with your streak.
Is the number prime or not? The number range grows as your streak builds.
Scores are saved in this browser only.
О сервисе и как это работает
Discover how Prime Number Game executes your workflow locally in your browser with zero server uploads and total privacy.
Prime Number Game on Neranjan Tools is an ultra-fast, client-side utility crafted to deliver professional-grade processing without the privacy risks or upload delays of traditional cloud services. Whether handling sensitive business contracts, personal photos, or code snippets, you can accomplish your task in seconds.
Unlike conventional web converters that upload your confidential files to remote third-party servers, this tool operates 100% inside your browser's local sandbox using HTML5 Canvas, WebAssembly, and modern JavaScript engines. Your files are loaded into your device's memory, processed instantly by your local CPU and GPU, and saved directly to your disk, ensuring zero data leaks, zero server logging, and immunity to malware execution.
Пошаговая инструкция
Start the Round
Click "Start" to see your first number.
Decide Prime or Not
Click "Prime" if you think the number is prime, or "Not Prime" if it has other factors.
Check Your Answer
See instant correct/incorrect feedback. If you get a composite number wrong, its full factorization is shown so you can learn why.
Без хранения на сервере
Files never leave your device. Complete immunity from server breaches or data leaks.
Мгновенная обработка
Immediate processing powered by your local device hardware with zero upload wait times.
Поддержка всех устройств
Works smoothly on iOS, Android, macOS, Windows, and Linux across all modern browsers.
Навсегда 100% бесплатно
No hidden subscriptions, no credit card forms, and unlimited free daily usage.
Гарантия 100% конфиденциальности на стороне клиента
Neranjan Tools guarantees that Prime Number Game processes your data purely in your browser memory. We never store, log, or inspect your files, protecting you fully against virus uploads and data breaches.
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