Is 815 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 815 is composite or not first we have to find its factors.
Contents
Factors of 815:
- If we have taken numbers from 1, 2, 3…for checking factors of 815, we found that 815 has factors 1, 5, 163 and 815. Hence, we must say that 815 is a composite number.
- Thus, 815 is the composite number.
- If we multiply 815 by 1, 2, 3 then we get the multiples of 815 which are 815, 1630 and so on.
815 is a Composite number or Prime number
About the number 815:
- 815 has more than two factors which are 1, 5, 163 and 815 and hence it is the composite number.
- 815 is the odd composite number and it is not the perfect square also.
- If we divide 815 by 1, 5, 163 and 815 then we get remainder as zero. Hence, 1, 5, 163 and 815 are the factors of 815
Note:
- 815 is not the perfect square.
- Factors of 815: 1, 5, 163 and 815
- Prime factors of 815: 5, 163
Conclusion:
- 815 is the composite number which has factors 1, 5, 163 and 815.
- And hence, 815 is not the prime number.
Multiple Choice Questions:
1) 815 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 815 are
a) 1
b) 5, 163
c) 1 and 815
d) 1, 5, 163 and 815
Ans: b) 5, 163
3) 815 is the odd composite number because
a) It has factors 1, 5, 163 and 815
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c