Mathlean · Online math workspace
Prime number checker
Test whether an integer is prime using the engine's primality operation.
How to use this calculator
Replace 97 with your integer; 97 is prime while 91 is divisible by 7.
Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.
Try it here
Interactive tools require JavaScript. You can read the guide and example without it.
What to know
Large-number tests may reach engine limits. A displayed Boolean is not a printable primality certificate.
Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.