Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 1)
1.
Which one of the following is not a prime number?
31
61
71
91
Answer: Option
Explanation:
91 is divisible by 7. So, it is not a prime number.
Discussion:
108 comments Page 6 of 11.

Revanna p said:   9 years ago
How does 91 come?

J.KRISHNAVENI said:   9 years ago
@Dilipkumar.

Only for few numbers given for short cut in prime numbers. So please given for other numbers in the short cut method.

Shailesh said:   9 years ago
If the number is divisible by 2 and 3 both, then it is divisible by 6.

Akshay said:   9 years ago
Please, someone, know the method for divisibility of 6?

Shamanth said:   9 years ago
How can we find the number of prime numbers below 'n' numbers ?

Poojarani said:   9 years ago
Thank you @Santosh.

Hello said:   9 years ago
Thank you for explaining the problem.

Swati said:   9 years ago
@Dilipkumar(Cse).

Is there any method to find the prime number between 1 to 1000?

Dhruba said:   9 years ago
Sorry, I can't understand. Can anyone explain the answer with an easy method?

Mahalakshmi said:   10 years ago
What is prime numbers how we have have to do calculation? Please explain me in detail.


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