The number 1111.....1(91 times) is a

A) prime b) non prime c) even

Answer:
The number 1111....1 ( 91 times )
We know prime numbers are those number whose are divisible by itself and 1 only 

And as we know even numbers end digit is in form of ( 0 , 2 , 4 , 6 , 8 )

And here the end digit is  1 so this number is odd number , So that is not even  .

As here ( 111111.... ) ( 91 times )
And
91 = 7 * 13 
So our number ( 1111111....... ) ( 91 times )  is divisible by  ( 1111111 ) ( 7 Times )  And ( 1111111111111 ) ( 13 times )


So we can say that number is a non-prime number.

Option B       ( Ans )