Is 87 is a Composite number

 Is 87 is a composite number or not ?

  • As we already know that, the number having factors 1 and the number itself is the prime number.
  • And numbers having more than these two factors are the composite numbers.
  • To check whether the number 87 is composite or not first we have to find its factors.

 

Factors of 87:

  • If we have taken numbers from 1, 2, 3…for checking factors of 87, we found that 87 has factors 1, 3, 29 and 87. Hence, we must say that 87 is a composite number.
  • Thus, 87 is the composite number.
  • If we multiply 87 by 1, 2, 3 then we get the multiples of 87 which are 87, 174, and so on.

 

About the number 87:

  • 87 has more than two factors which are 1,3, 29and 87 and hence it is the composite number.
  • 87 is the odd composite number and it is not the perfect square also.
  • If we divide 87 by 1, 3, 29 and 87 then we get remainder as zero. Hence, 1, 3, 29 and 87 are the factors of 87.

 

Note:

  • 87 is not the perfect square.
  • Factors of 87: 1, 3, 29 and 87
  • Prime factors of 87: 3, 29

 

Conclusion:

  • 87 is the composite number which has factors 1, 3, 29and 87.
  • And hence, 87 is not the prime number.

 

Multiple Choice Questions:

 

1) 87 is a

a) odd number

b) Prime number

c) Composite number

d) Both a and c

Ans: d) both a and c

 

2) The prime factors of a composite number 87 are

a) 1

b) 3, 29

c) Both a and b

d) 871

Ans: b) 3, 29

 

3) 1 is the not prime factor of 87 because

a) It is the prime number

b) 1 is neither prime nor composite number

c) Both a and b

d) Given statement is false

Ans: b) 1 is neither prime nor composite number

Updated: November 24, 2021 — 11:41 am

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