Is 981 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 981 is composite or not first we have to find its factors.
Contents
Factors of 981:
- If we have taken numbers from 1, 2, 3…for checking factors of 981, we found that 981 has factors 1, 3, 9, 109, 327 and 981. Hence, we must say that 981 is a composite number.
- Thus, 981 is the composite number.
- If we multiply 981 by 1, 2, 3 then we get the multiples of 981 which are 981, 1962 and so on.
981 is a Composite number or Prime number
About the number 981:
- 981 has more than two factors which are 1, 3, 9, 109, 327 and 981 and hence it is the composite number.
- 981 is the odd composite number and it is not the perfect square also.
- If we divide 981 by 1, 3, 9, 109, 327 and 981 then we get remainder as zero. Hence, 1, 3, 9, 109, 327 and 981 are the factors of 981
Note:
- 981 is not the perfect square.
- Factors of 981: 1, 3, 9, 109, 327 and 981
- Prime factors of 981: 3, 109
Conclusion:
- 981 is the composite number which has factors 1, 3, 9, 109, 327 and 981.
- And hence, 981 is not the prime number.
Multiple Choice Questions:
1) 981 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 981 are
a) 1
b) 3, 109
c) 1, 9, 327 and 981
d) 1, 3, 9, 109, 327 and 981
Ans: b) 3, 109
3) 981 is the odd composite number because
a) It has factors 1, 3, 9, 109, 327 and 981
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c