Aptitude - Numbers - Discussion

Thank you @Dilipkumar.

Thank you @Santosh.

Thanks @Nidhin.

Prime number is nothing but it is divisible by one and itself that type of numbers called prime numbers.

91is not a prime no. Because it is divisible by 13.

Code for prime numbers below 100 is 442233322321.

2,3,5,7 (4)
11,13,17,19 (4)
23,29 (2)
31,37 (2)
41,43,47 (3)
53,59 (2)
61,67 (20
71,73,79 (3)
83,89 (2)
97 (1)

@Karthick.

I have not understood your process please explain me with the other examples.

For 3 numbers calculation:

Let us find whether 149 is prime or not.
[square root of 149= 12.20 < 13] prime numbers below 13 are 2,3,5,7,11.
149 is not exactly divisible by 2, because it don't has even number at the end.
149 is not exactly divisible by 3, because the sum of numbers 1+4+9= 14 is not divisible by 3.
149 is not exactly divisible by 5, because it don't has 0 or 5 at the end.
149 is not exactly divisible by 7,11.
So, 149 is a prime number.

The Prime number means any number is divisible by one and itself.

how to solve this question? Please tell me.