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 8 of 11.

Eswar said:   1 decade ago
Can we use this shortcut for 3 and 4 digits?

Namrata said:   8 years ago
how to solve this question? Please tell me.

Vishwanth said:   2 months ago
No, @Jitu,

71 will not be divisible by 3.
(3)

Shaziya said:   1 decade ago
A negative number can be a prime number?

Reshma said:   1 decade ago
Explain one example with 3 digit number?

Vishala said:   3 years ago
Thank you all for explaining the answer.
(20)

Sagarganeshkar said:   5 years ago
It is very easy by divisibility rules.
(1)

Tinku das said:   1 decade ago
I want to know why 1 is not prime no?

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

Amare muluken said:   2 years ago
Thanks all for explaining the answer.
(13)


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