Is 1665 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 1665 is composite or not first we have to find its factors.
Contents
Factors of 1665:
- If we have taken numbers from 1, 2, 3…for checking factors of 1665, we found that 1665 has factors 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665. Hence, we must say that 1665 is a composite number.
- Thus, 1665 is the composite number.
- If we multiply 1665 by 1, 2, 3 then we get the multiples of 1665 which are 1665, 3330 and so on.
1665 is a Composite number or Prime number
About the number 1665:
- 1665 has more than two factors which are 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665 and hence it is the composite number.
- 1665 is the odd composite number and it is not the perfect square also.
- If we divide 1665 by 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665 then we get remainder as zero. Hence, 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665 are the factors of 1665
Note:
- 1665 is not the perfect square.
- Factors of 1665: 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665
- Prime factors of 1665: 3, 5, 37
Conclusion:
- 1665 is the composite number which has factors 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665.
- And hence, 1665 is not the prime number.
Multiple Choice Questions:
1) 1665 is a
a) Even number
b) Prime number
c) Composite number
d) Both a and c
Ans: c) composite number
2) The non-prime factors of a composite number 1665 are
a) 1
b) 3, 5, 37
c) 1, 9, 15, 45, 111, 185, 333, 555 and 1665
d) 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665
Ans: b) 1, 9, 15, 45, 111, 185, 333, 555 and 1665
3) 1665 is the odd composite number because
a) It has factors 1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555 and 1665
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all