Is 689 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 689 is composite or not first we have to find its factors.
Contents
Factors of 689:
- If we have taken numbers from 1, 2, 3…for checking factors of 689, we found that 689 has factors 1, 13, 53 and 689. Hence, we must say that 689 is a composite number.
- Thus, 689 is the composite number.
- If we multiply 689 by 1, 2, 3 then we get the multiples of 689 which are 689, 1378 and so on.
689 is a Composite number or Prime number
About the number 689:
- 689 has more than two factors which are 1, 13, 53 and 689 and hence it is the composite number.
- 689 is the odd composite number and it is not the perfect square also.
- If we divide 689 by 1, 13, 53 and 689 then we get remainder as zero. Hence, 1, 13, 53 and 689 are the factors of 689.
Note:
- 689 is not the perfect square.
- Factors of 689: 1, 13, 53 and 689
- Prime factors of 689: 13, 53
Conclusion:
- 689 is the composite number which has factors 1, 13, 53 and 689.
- And hence, 689 is not the prime number.
Multiple Choice Questions:
1) 689 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 689 are
a) 1
b) 13, 53
c) 1 and 689
d) 1, 13, 53 and 689
Ans: b) 13, 53
3) 689 is the odd composite number because
a) It has factors 1, 13, 53 and 689
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c