Is 1905 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 1905 is composite or not first we have to find its factors.
Contents
Factors of 1905:
- If we have taken numbers from 1, 2, 3…for checking factors of 1905, we found that 1905 has factors 1, 3, 5, 15, 127, 381, 635 and 1905. Hence, we must say that 1905 is a composite number.
- Thus, 1905 is the composite number.
- If we multiply 1905 by 1, 2, 3 then we get the multiples of 1905 which are 1905, 3810 and so on.
1905 is a Composite number or Prime number
About the number 1905:
- 1905 has more than two factors which are 1, 3, 5, 15, 127, 381, 635 and 1905 and hence it is the composite number.
- 1905 is the odd composite number and it is not the perfect square also.
- If we divide 1905 by 1, 3, 5, 15, 127, 381, 635 and 1905 then we get remainder as zero. Hence, 1, 3, 5, 15, 127, 381, 635 and 1905 are the factors of 1905
Note:
- 1905 is not the perfect square.
- Factors of 1905: 1, 3, 5, 15, 127, 381, 635 and 1905
- Prime factors of 1905: 3, 5, 127
Conclusion:
- 1905 is the composite number which has factors 1, 3, 5, 15, 127, 381, 635 and 1905.
- And hence, 1905 is not the prime number.
Multiple Choice Questions:
1) 1905 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 1905 are
a) 1
b) 3, 5, 127
c) 1, 15, 381, 635 and 1905
d) 1, 3, 5, 15, 127, 381, 635 and 1905
Ans: b) 1, 15, 381, 635 and 1905
3) 1905 is the odd composite number because
a) It has factors 1, 3, 5, 15, 127, 381, 635 and 1905
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all