Is 891 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 891 is composite or not first we have to find its factors.
Contents
Factors of 891:
- If we have taken numbers from 1, 2, 3…for checking factors of 891, we found that 891 has factors 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891. Hence, we must say that 891 is a composite number.
- Thus, 891 is the composite number.
- If we multiply 891 by 1, 2, 3 then we get the multiples of 891 which are 891, 1782 and so on.
891 is a Composite number or Prime number
About the number 891:
- 891 has more than two factors which are 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891 and hence it is the composite number.
- 891 is the odd composite number and it is not the perfect square also.
- If we divide 891 by 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891 then we get remainder as zero. Hence, 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891 are the factors of 891
Note:
- 891 is not the perfect square.
- Factors of 891: 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891
- Prime factors of 891: 3, 11
Conclusion:
- 891 is the composite number which has factors 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891.
- And hence, 891 is not the prime number.
Multiple Choice Questions:
1) 891 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 891 are
a) 1
b) 3, 11
c) 1, 9, 27, 33, 81, 99, 297 and 891
d) 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891
Ans: b) 3, 11
3) 891 is the odd composite number because
a) It has factors 1, 3, 9, 11, 27, 33, 81, 99, 297 and 891
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c