Is 987 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 987 is composite or not first we have to find its factors.
Contents
Factors of 987:
- If we have taken numbers from 1, 2, 3…for checking factors of 987, we found that 987 has factors 1, 3, 7, 21, 47, 141, 329 and 987. Hence, we must say that 987 is a composite number.
- Thus, 987 is the composite number.
- If we multiply 987 by 1, 2, 3 then we get the multiples of 987 which are 987, 1974 and so on.
987 is a Composite number or Prime number
About the number 987:
- 987 has more than two factors which are 1, 3, 7, 21, 47, 141, 329 and 987 and hence it is the composite number.
- 987 is the odd composite number and it is not the perfect square also.
- If we divide 987 by 1, 3, 7, 21, 47, 141, 329 and 987 then we get remainder as zero. Hence, 1, 3, 7, 21, 47, 141, 329 and 987 are the factors of 987
Note:
- 987 is not the perfect square.
- Factors of 987: 1, 3, 7, 21, 47, 141, 329 and 987
- Prime factors of 987: 3, 7, 47
Conclusion:
- 987 is the composite number which has factors 1, 3, 7, 21, 47, 141, 329 and 987.
- And hence, 987 is not the prime number.
Multiple Choice Questions:
1) 987 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 987 are
a) 1
b) 3, 7, 47
c) 1, 21, 141, 329 and 987
d) 1, 3, 7, 21, 47, 141, 329 and 987
Ans: b) 3, 7, 47
3) 987 is the odd composite number because
a) It has factors 1, 3, 7, 21, 47, 141, 329 and 987
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c