Is 1605 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 1605 is composite or not first we have to find its factors.
Contents
Factors of 1605:
- If we have taken numbers from 1, 2, 3…for checking factors of 1605, we found that 1605 has factors 1, 3, 5, 15, 107, 321, 535 and 1605. Hence, we must say that 1605 is a composite number.
- Thus, 1605 is the composite number.
- If we multiply 1605 by 1, 2, 3 then we get the multiples of 1605 which are 1605, 3210 and so on.
1605 is a Composite number or Prime number
About the number 1605:
- 1605 has more than two factors which are 1, 3, 5, 15, 107, 321, 535 and 1605 and hence it is the composite number.
- 1605 is the odd composite number and it is not the perfect square also.
- If we divide 1605 by 1, 3, 5, 15, 107, 321, 535 and 1605 then we get remainder as zero. Hence, 1, 3, 5, 15, 107, 321, 535 and 1605 are the factors of 1605
Note:
- 1605 is not the perfect square.
- Factors of 1605: 1, 3, 5, 15, 107, 321, 535 and 1605
- Prime factors of 1605: 3, 5, 107
Conclusion:
- 1605 is the composite number which has factors 1, 3, 5, 15, 107, 321, 535 and 1605.
- And hence, 1605 is not the prime number.
Multiple Choice Questions:
1) 1605 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 1605 are
a) 1
b) 3, 5, 107
c) 1, 15, 321, 535 and 1605
d) 1, 3, 5, 15, 107, 321, 535 and 1605
Ans: b) 1, 15, 321, 535 and 1605
3) 1605 is the odd composite number because
a) It has factors 1, 3, 5, 15, 107, 321, 535 and 1605
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all