I did that(making isPrime() method) but still no progress

I am not able to see your above comment

it is not working. Above is my code, if you can do something please let me know. I am new in coding, hope you can help.

Java

I made it to 2600 ms for random test but still unable to submit it.

Random test is getting completed in around 3500 ms, then why it is taking more than 10000 ms when I am submitting it.

i understood it now.Thanks

BasicTests(CheckchooseTest)
****** Basic Tests ******
Test Passed
RandomTests(CheckchooseTest)
****** Random tests ******
Numbers m 646647 ,n 22
Numbers m 2 ,n 6
Numbers m 84 ,n 9
Numbers m 2 ,n 10
Numbers m 20058300 ,n 27
expected: but was:<-1>
OtherTests(CheckchooseTest)
****** Other Numbers ******
expected: but was:<-1>

language-java
BasicTests(CheckchooseTest)
****** Basic Tests ******
Test Passed
RandomTests(CheckchooseTest)
****** Random tests ******
Numbers m 646647 ,n 22
Numbers m 2 ,n 6
Numbers m 84 ,n 9
Numbers m 2 ,n 10
Numbers m 20058300 ,n 27
expected:<13> but was:<-1>
OtherTests(CheckchooseTest)
****** Other Numbers ******
expected:<10> but was:<-1>