Is 1545 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 1545 is composite or not first we have to find its factors.
Contents
Factors of 1545:
- If we have taken numbers from 1, 2, 3…for checking factors of 1545, we found that 1545 has factors 1, 3, 5, 15, 103, 309, 515 and 1545. Hence, we must say that 1545 is a composite number.
- Thus, 1545 is the composite number.
- If we multiply 1545 by 1, 2, 3 then we get the multiples of 1545 which are 1545, 3090 and so on.
1545 is a Composite number or Prime number
About the number 1545:
- 1545 has more than two factors which are 1, 3, 5, 15, 103, 309, 515 and 1545 and hence it is the composite number.
- 1545 is the odd composite number and it is not the perfect square also.
- If we divide 1545 by 1, 3, 5, 15, 103, 309, 515 and 1545 then we get remainder as zero. Hence, 1, 3, 5, 15, 103, 309, 515 and 1545 are the factors of 1545
Note:
- 1545 is not the perfect square.
- Factors of 1545: 1, 3, 5, 15, 103, 309, 515 and 1545
- Prime factors of 1545: 3, 5, 103
Conclusion:
- 1545 is the composite number which has factors 1, 3, 5, 15, 103, 309, 515 and 1545.
- And hence, 1545 is not the prime number.
Multiple Choice Questions:
1) 1545 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 1545 are
a) 1
b) 3, 5, 103
c) 1, 15, 309, 515 and 1545
d) 1, 3, 5, 15, 103, 309, 515 and 1545
Ans: b) 1, 15, 309, 515 and 1545
3) 1545 is the odd composite number because
a) It has factors 1, 3, 5, 15, 103, 309, 515 and 1545
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all