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Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 82)
Numbers
82.
Which one of the following is a prime number ?
119
187
247
551
None of these
Answer: Option
Explanation:

551 > 22

All prime numbers less than 24 are : 2, 3, 5, 7, 11, 13, 17, 19, 23.

119 is divisible by 7; 187 is divisible by 11; 247 is divisible by 13 and 551 is divisible by 19.

So, none of the given numbers is prime.

Discussion:
11 comments Page 1 of 2.
Bhargavi R said:   4 years ago
How to find the √ of any number.

Please Explain in detail.
(1)
NK Liya said:   4 years ago
How to find the square root of a number?

Anyone explain in details.
(1)
Soundarya said:   5 years ago
I can't understand this, Please can anyone explain this?
(1)
Anusha said:   5 years ago
Thanks @Kavitha.
Deva said:   8 years ago
Well Explained.

Thank You @Kavitha.
Kavitha said:   9 years ago
Step:1 first see, all the options and find the largest number in those given, here 551.

Step:2 take the square root of 551=23.47.

Step3: find all the primes up to 23.

Step4: then check each and every option whether it is divisible by any of these primes.

If it is divisible by any of those primes, it is not a prime.
(4)
Albin Antony said:   9 years ago
Sqrt (551) = 23.47 < 24.

Take primes which are less than 24.

Then check the divisibility of the given options with the above prime numbers.
Yadnit said:   9 years ago
Sqrt 551 > 22.

From where 22 came, Can anyone explain?
Prince said:   9 years ago
Please explain the solution.
Kim said:   1 decade ago
Can anybody please explain?
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