Is 615 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 615 is composite or not first we have to find its factors.
Contents
Factors of 615:
- If we have taken numbers from 1, 2, 3…for checking factors of 615, we found that 615 has factors 1, 3, 5, 15, 41, 123, 205 and 615. Hence, we must say that 615 is a composite number.
- Thus, 615 is the composite number.
- If we multiply 615 by 1, 2, 3 then we get the multiples of 615 which are 615, 1230 and so on.
615 is a Composite number or Prime number
About the number 615:
- 615 has more than two factors which are 1, 3, 5, 15, 41, 123, 205 and 615 and hence it is the composite number.
- 615 is the odd composite number and it is not the perfect square also.
- If we divide 615 by 1, 3, 5, 15, 41, 123, 205 and 615 then we get remainder as zero. Hence, 1, 3, 5, 15, 41, 123, 205 and 615 are the factors of 615.
Note:
- 615 is not the perfect square.
- Factors of 615: 1, 3, 5, 15, 41, 123, 205 and 615
- Prime factors of 615: 3, 5, 41
Conclusion:
- 615 is the composite number which has factors 1, 3, 5, 15, 41, 123, 205 and 615.
- And hence, 615 is not the prime number.
Multiple Choice Questions:
1) 615 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 615 are
a) 1
b) 3, 5, 41
c) 1, 15, 123, 205 and 615
d) 1, 3, 5, 15, 41, 123, 205 and 615
Ans: b) 3, 5, 41
3) 615 is the odd composite number because
a) It has factors 1, 3, 5, 15, 41, 123, 205 and 615
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c