Is 665 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 665 is composite or not first we have to find its factors.
Contents
Factors of 665:
- If we have taken numbers from 1, 2, 3…for checking factors of 665, we found that 665 has factors 1, 5, 7, 19, 35, 95, 133 and 665. Hence, we must say that 665 is a composite number.
- Thus, 665 is the composite number.
- If we multiply 665 by 1, 2, 3 then we get the multiples of 665 which are 665, 1330 and so on.
665 is a Composite number or Prime number
About the number 665:
- 665 has more than two factors which are 1, 5, 7, 19, 35, 95, 133 and 665 and hence it is the composite number.
- 665 is the odd composite number and it is not the perfect square also.
- If we divide 665 by 1, 5, 7, 19, 35, 95, 133 and 665 then we get remainder as zero. Hence, 1, 5, 7, 19, 35, 95, 133 and 665 are the factors of 665.
Note:
- 665 is not the perfect square.
- Factors of 665: 1, 5, 7, 19, 35, 95, 133 and 665
- Prime factors of 665: 5, 7, 19
Conclusion:
- 665 is the composite number which has factors 1, 5, 7, 19, 35, 95, 133 and 665.
- And hence, 665 is not the prime number.
Multiple Choice Questions:
1) 665 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 665 are
a) 1
b) 5, 7, 19
c) 1, 35, 95, 133 and 665
d) 1, 5, 7, 19, 35, 95, 133 and 665
Ans: b) 5, 7, 19
3) 665 is the odd composite number because
a) It has factors 1, 5, 7, 19, 35, 95, 133 and 665
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c