What defines a prime number?
A prime number is a whole number greater than 1 whose only factors are 1 and itself.

Classic Puzzle
Prime Hunter is a number theory puzzle built for players who like fast mathematical decisions. Identify and click on prime numbers—numbers divisible only by 1 and themselves—within the grid. Find all primes before the timer expires to level up. Be careful: clicking a non-prime number reduces your remaining time by 5 seconds. Higher levels feature larger grids and broader number ranges. Tap play to open the full game. Once you start, the interactive board and controls will appear immediately below.
A prime number is a whole number greater than 1 whose only factors are 1 and itself.
Selecting a non-prime number results in a 5-second time penalty.
Clear all prime numbers currently visible on the grid before time runs out.
Yes, as you level up, the grid size increases and the numbers become larger and harder to identify.