Is 3905 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 3905 is composite or not first we have to find its factors.
Contents
Factors of 3905:
- If we have taken numbers from 1, 2, 3…for checking factors of 3905, we found that 3905 has factors 1, 5, 11, 55, 71, 355, 781 and 3905. Hence, we must say that 3905 is a composite number.
- Thus, 3905 is the composite number.
- If we multiply 3905 by 1, 2, 3 then we get the multiples of 3905 which are 3905, 7810 and so on.
3905 is a Composite number or Prime number
About the number 3905:
- 3905 has more than two factors which are 1, 5, 11, 55, 71, 355, 781 and 3905 and hence it is the composite number.
- 3905 is the odd composite number and it is not the perfect square also.
- If we divide 3905 by 1, 5, 11, 55, 71, 355, 781 and 3905 then we get remainder as zero. Hence 1, 5, 11, 55, 71, 355, 781 and 3905 are the factors of 3905
Note:
- 3905 is not the perfect square.
- Factors of 3905:1, 5, 11, 55, 71, 355, 781 and 3905
- Prime factors of 3905: 5, 11, 71
Conclusion:
- 3905 is the composite number which has factors 1, 5, 11, 55, 71, 355, 781 and 3905.
- And hence, 3905 is not the prime number.
Multiple Choice Questions:
1) 3905 is a
a) odd number
b) Prime number
c) even number
d) Both a and c
Ans: a) odd number
2) The non-prime factors of a composite number 3905 are
a) 1
b) 5, 11, 71
c) 1, 5, 11, 55, 71, 355, 781 and 3905
d) 1, 55, 355, 781 and 3905
Ans: d)1, 55, 355, 781 and 3905
3) 3905 is the odd composite number because
a) It has factors 1, 5, 11, 55, 71, 355, 781 and 3905
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all
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