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QA – Placement Quizzes | Numbers, LCM and HCF | Question 2
• Last Updated : 16 May, 2019

Which of the following are prime numbers ?

(A) 147
(B) 327
(C) 547
(D) 637

Explanation: (i) 147
132 = 169 > 147. Prime numbers less than 13 are 2, 3, 5, 7, 11.
147 is divisible by 3. Therefore, 147 is not a prime number. It is a composite number.

(ii) 327
192 = 361 > 327. Prime numbers less than 19 are 2, 3, 5, 7, 11, 13, 17.
327 is divisible by 3. Therefore, 327 is not a prime number. It is a composite number.

(iii) 547
242 = 576 > 547. Prime numbers less than 24 are 2, 3, 5, 7, 11, 13, 17, 19, 23.
547 is not divisible by any of the above prime numbers. Therefore, it is a prime number.

(iv) 637
262 = 676 > 637. Prime numbers less than 26 are 2, 3, 5, 7, 11, 13, 17, 19, 23.
637 is divisible by 7. Therefore, 637 is not a prime number. It is a composite number.

Hence, 547 is the only prime number among the given numbers.

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