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Q.

Which of the following numbers is a prime number?

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a

667

b

861

c

481

d

331

answer is D.

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Detailed Solution

When the number is only divisible by 1 and itself then such number is called the prime number.
Now, we have use the divisible method for the given option.
Here, Digit 667 is divisible by 23, so it is not a prime number.
Digit 861 is divisible by 3, so it is not a prime number.
Digit 481 is divisible by 13, so it is not a prime number.
Digit 331 is divisible only by 1 and 331, so it is a prime number.
Hence the digit 331 is a prime number.
Option 4 is correct.

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