Is 687 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 687 is composite or not first we have to find its factors.
Contents
Factors of 687:
- If we have taken numbers from 1, 2, 3…for checking factors of 687, we found that 687 has factors 1, 3, 229 and 687. Hence, we must say that 687 is a composite number.
- Thus, 687 is the composite number.
- If we multiply 687 by 1, 2, 3 then we get the multiples of 687 which are 687, 1374 and so on.
687 is a Composite number or Prime number
About the number 687:
- 687 has more than two factors which are 1, 3, 229 and 687 and hence it is the composite number.
- 687 is the odd composite number and it is not the perfect square also.
- If we divide 687 by 1, 3, 229 and 687 then we get remainder as zero. Hence, 1, 3, 229 and 687 are the factors of 687.
Note:
- 687 is not the perfect square.
- Factors of 687: 1, 3, 229 and 687
- Prime factors of 687: 3, 229
Conclusion:
- 687 is the composite number which has factors 1, 3, 229 and 687.
- And hence, 687 is not the prime number.
Multiple Choice Questions:
1) 687 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 687 are
a) 1
b) 3, 229
c) 1 and 687
d) 1, 3, 229 and 687
Ans: b) 3, 229
3) 687 is the odd composite number because
a) It has factors 1, 3, 229 and 687
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c