Is 1185 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 1185 is composite or not first we have to find its factors.
Contents
Factors of 1185:
- If we have taken numbers from 1, 2, 3…for checking factors of 1185, we found that 1185 has factors 1, 3, 5, 15, 79, 237, 395 and 1185. Hence, we must say that 1185 is a composite number.
- Thus, 1185 is the composite number.
- If we multiply 1185 by 1, 2, 3 then we get the multiples of 1185 which are 1185, 2370 and so on.
1185 is a Composite number or Prime number
About the number 1185:
- 1185 has more than two factors which are 1, 3, 5, 15, 79, 237, 395 and 1185 and hence it is the composite number.
- 1185 is the odd composite number and it is not the perfect square also.
- If we divide 1185 by 1, 3, 5, 15, 79, 237, 395 and 1185 then we get remainder as zero. Hence, 1, 3, 5, 15, 79, 237, 395 and 1185 are the factors of 1185
Note:
- 1185 is not the perfect square.
- Factors of 1185: 1, 3, 5, 15, 79, 237, 395 and 1185
- Prime factors of 1185: 3, 5, 79
Conclusion:
- 1185 is the composite number which has factors 1, 3, 5, 15, 79, 237, 395 and 1185.
- And hence, 1185 is not the prime number.
Multiple Choice Questions:
1) 1185 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 1185 are
a) 1
b) 3, 5, 79
c) 1, 15, 237, 395 and 1185
d) 1, 3, 5, 15, 79, 237, 395 and 1185
Ans: b) 3, 5, 79
3) 1185 is the odd composite number because
a) It has factors 1, 3, 5, 15, 79, 237, 395 and 1185
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c