Is 1281 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 1281 is composite or not first we have to find its factors.
Contents
Factors of 1281:
- If we have taken numbers from 1, 2, 3…for checking factors of 1281, we found that 1281 has factors 1, 3, 7, 21, 61, 183, 427 and 1281. Hence, we must say that 1281 is a composite number.
- Thus, 1281 is the composite number.
- If we multiply 1281 by 1, 2, 3 then we get the multiples of 1281 which are 1281, 2562 and so on.
1281 is a Composite number or Prime number
About the number 1281:
- 1281 has more than two factors which are 1, 3, 7, 21, 61, 183, 427 and 1281 and hence it is the composite number.
- 1281 is the odd composite number and it is not the perfect square also.
- If we divide 1281 by 1, 3, 7, 21, 61, 183, 427 and 1281 then we get remainder as zero. Hence, 1, 3, 7, 21, 61, 183, 427 and 1281 are the factors of 1281
Note:
- 1281 is not the perfect square.
- Factors of 1281: 1, 3, 7, 21, 61, 183, 427 and 1281
- Prime factors of 1281: 3, 7, 61
Conclusion:
- 1281 is the composite number which has factors 1, 3, 7, 21, 61, 183, 427 and 1281.
- And hence, 1281 is not the prime number.
Multiple Choice Questions:
1) 1281 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 1281 are
a) 1
b) 3, 7, 61
c) 1, 21, 183, 427 and 1281
d) 1, 3, 7, 21, 61, 183, 427 and 1281
Ans: b) 1, 21, 183, 427 and 1281
3) 1281 is the odd composite number because
a) It has factors 1, 3, 7, 21, 61, 183, 427 and 1281
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all