Is 1405 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 1405 is composite or not first we have to find its factors.
Contents
Factors of 1405:
- If we have taken numbers from 1, 2, 3…for checking factors of 1405, we found that 1405 has factors 1, 5, 281 and 1405. Hence, we must say that 1405 is a composite number.
- Thus, 1405 is the composite number.
- If we multiply 1405 by 1, 2, 3 then we get the multiples of 1405 which are 1405, 2810 and so on.
1405 is a Composite number or Prime number
About the number 1405:
- 1405 has more than two factors which are 1, 5, 281 and 1405 and hence it is the composite number.
- 1405 is the odd composite number and it is not the perfect square also.
- If we divide 1405 by 1, 5, 281 and 1405 then we get remainder as zero. Hence, 1, 5, 281 and 1405 are the factors of 1405
Note:
- 1405 is not the perfect square.
- Factors of 1405: 1, 5, 281 and 1405
- Prime factors of 1405: 5, 281
Conclusion:
- 1405 is the composite number which has factors 1, 5, 281 and 1405.
- And hence, 1405 is not the prime number.
Multiple Choice Questions:
1) 1405 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 1405 are
a) 1
b) 5, 281
c) 1 and 1405
d) 1, 5, 281 and 1405
Ans: b) 1 and 1405
3) 1405 is the odd composite number because
a) It has factors 1, 5, 281 and 1405
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all