Is 1285 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 1285 is composite or not first we have to find its factors.
Contents
Factors of 1285:
- If we have taken numbers from 1, 2, 3…for checking factors of 1285, we found that 1285 has factors 1, 5, 257 and 1285. Hence, we must say that 1285 is a composite number.
- Thus, 1285 is the composite number.
- If we multiply 1285 by 1, 2, 3 then we get the multiples of 1285 which are 1285, 2570 and so on.
1285 is a Composite number or Prime number
About the number 1285:
- 1285 has more than two factors which are 1, 5, 257 and 1285 and hence it is the composite number.
- 1285 is the odd composite number and it is not the perfect square also.
- If we divide 1285 by 1, 5, 257 and 1285 then we get remainder as zero. Hence, 1, 5, 257 and 1285 are the factors of 1285
Note:
- 1285 is not the perfect square.
- Factors of 1285: 1, 5, 257 and 1285
- Prime factors of 1285: 5, 257
Conclusion:
- 1285 is the composite number which has factors 1, 5, 257 and 1285.
- And hence, 1285 is not the prime number.
Multiple Choice Questions:
1) 1285 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 1285 are
a) 1
b) 5, 257
c) 1 and 1285
d) 1, 5, 257 and 1285
Ans: b) 1 and 1285
3) 1285 is the odd composite number because
a) It has factors 1, 5, 257 and 1285
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all