Which one of the following is a prime number?

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119

187

247

None of these

answer is D.

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Detailed Solution

Concept-Writes all the factors of each number specified in the option to find the prime number. If the number is only 1 and it is a factor in itself, it is a prime number.
Given data, prime numbers. There are only two factors in a prime number, one and itself.
For example, 2, 3, 5, 7, 11, 13, 17, 19 ..... Next, let's factor each option 119
It can be expressed as

and

. Therefore, 119 is not a prime number. 187
It can be represented by

and

. Therefore, 187 is not a prime number. 247
It can be expressed as

and

. Therefore, 247 is not a prime number. 551
Therefore, none of the above numbers are prime and the options are not.
Hence, option 4 is the correct answer.

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