Is 845 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 845 is composite or not first we have to find its factors.
Contents
Factors of 845:
- If we have taken numbers from 1, 2, 3…for checking factors of 845, we found that 845 has factors 1, 5, 13, 65, 169 and 845. Hence, we must say that 845 is a composite number.
- Thus, 845 is the composite number.
- If we multiply 845 by 1, 2, 3 then we get the multiples of 845 which are 845, 1690 and so on.
About the number 845:
- 845 has more than two factors which are 1, 5, 13, 65, 169 and 845 and hence it is the composite number.
- 845 is the odd composite number and it is not the perfect square also.
- If we divide 845 by 1, 5, 13, 65, 169 and 845 then we get remainder as zero. Hence, 1, 5, 13, 65, 169 and 845 are the factors of 845
Note:
- 845 is not the perfect square.
- Factors of 845: 1, 5, 13, 65, 169 and 845
- Prime factors of 845: 5, 13, 65
Conclusion:
- 845 is the composite number which has factors 1, 5, 13, 65, 169 and 845.
- And hence, 845 is not the prime number.
Multiple Choice Questions:
1) 845 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and c
Ans: d) both a and c
2) The prime factors of a composite number 845 are
a) 1
b) 5, 13, 65
c) 1, 169 and 845
d) 1, 5, 13, 65, 169 and 845
Ans: b) 5, 13, 65
3) 845 is the odd composite number because
a) It has factors 1, 5, 13, 65, 169 and 845
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c