Is 1805 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 1805 is composite or not first we have to find its factors.
Contents
Factors of 1805:
- If we have taken numbers from 1, 2, 3…for checking factors of 1805, we found that 1805 has factors 1, 5, 19, 95, 361 and 1805. Hence, we must say that 1805 is a composite number.
- Thus, 1805 is the composite number.
- If we multiply 1805 by 1, 2, 3 then we get the multiples of 1805 which are 1805, 3610 and so on.
1805 is a Composite number or Prime number
About the number 1805:
- 1805 has more than two factors which are 1, 5, 19, 95, 361 and 1805 and hence it is the composite number.
- 1805 is the odd composite number and it is not the perfect square also.
- If we divide 1805 by 1, 5, 19, 95, 361 and 1805 then we get remainder as zero. Hence, 1, 5, 19, 95, 361 and 1805 are the factors of 1805
Note:
- 1805 is not the perfect square.
- Factors of 1805: 1, 5, 19, 95, 361 and 1805
- Prime factors of 1805: 5, 19
Conclusion:
- 1805 is the composite number which has factors 1, 5, 19, 95, 361 and 1805.
- And hence, 1805 is not the prime number.
Multiple Choice Questions:
1) 1805 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 1805 are
a) 1
b) 5, 19
c) 1, 95, 361 and 1805
d) 1, 5, 19, 95, 361 and 1805
Ans: b) 1, 95, 361 and 1805
3) 1805 is the odd composite number because
a) It has factors 1, 5, 19, 95, 361 and 1805
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all