Prime! play online

It is the mini game that count up the number and judge prime number.
The prime number is stored and you can restart from any number up to the maximum stored.
When counting up to 9999999 the prime only mode is released.

There are two count up modes.
Manual count up mode
The number counts up when you tap the screen, and judge the prime number when you tap the screen again.
Automatic count up mode
The number automatically counts up once every 0.5 seconds, and judge the prime number after 0.5 seconds.