Is 255 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 255 is composite or not first we have to find its factors.
Contents
Factors of 255:
- If we have taken numbers from 1, 2, 3…for checking factors of 255, we found that 255 has factors 1, 3, 5, 15, 17, 51, 85 and 255. Hence, we must say that 255 is a composite number.
- Thus, 255 is the composite number.
- If we multiply 255 by 1, 2, 3 then we get the multiples of 255 which are 255, 510, and so on.
255 is a Composite number or Prime number
About the number 255:
- 255 has more than two factors which are 1, 3, 5, 15, 17, 51, 85 and 255 and hence it is the composite number.
- 255 is the odd composite number and it is not the perfect square also.
- If we divide 255 by 1, 3, 5, 15, 17, 51, 85 and 255 then we get remainder as zero. Hence, 1, 3, 5, 15, 17, 51, 85 and 255 are the factors of 255.
Note:
- 255 is not the perfect square.
- Factors of 255: 1, 3, 5, 15, 17, 51, 85 and 255
- Prime factors of 255: 3, 5, 17
Conclusion:
- 255 is the composite number which has factors 1, 3, 5, 15, 17, 51, 85 and 255.
- And hence, 255 is not the prime number.
Multiple Choice Questions:
1) 255 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 255 are
a) 1
b) 3, 5, 17
c) 1, 15, 51, 85 and 255
d) 1, 3, 5, 15, 17, 51, 85 and 255
Ans: b) 3, 5, 17
3) 255 is the odd composite number because
a) It has factors 1, 3, 5, 15, 17, 51, 85 and 255
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c