Is 1555 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 1555 is composite or not first we have to find its factors.
Contents
Factors of 1555:
- If we have taken numbers from 1, 2, 3…for checking factors of 1555, we found that 1555 has factors 1, 5, 311 and 1555. Hence, we must say that 1555 is a composite number.
- Thus, 1555 is the composite number.
- If we multiply 1555 by 1, 2, 3 then we get the multiples of 1555 which are 1555, 3110 and so on.
1555 is a Composite number or Prime number
About the number 1555:
- 1555 has more than two factors which are 1, 5, 311 and 1555 and hence it is the composite number.
- 1555 is the odd composite number and it is not the perfect square also.
- If we divide 1555 by 1, 5, 311 and 1555 then we get remainder as zero. Hence, 1, 5, 311 and 1555 are the factors of 1555
Note:
- 1555 is not the perfect square.
- Factors of 1555: 1, 5, 311 and 1555
- Prime factors of 1555: 5, 311
Conclusion:
- 1555 is the composite number which has factors 1, 5, 311 and 1555.
- And hence, 1555 is not the prime number.
Multiple Choice Questions:
1) 1555 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 1555 are
a) 1
b) 5, 311
c) 1 and 1555
d) 1, 5, 311 and 1555
Ans: b) 1 and 1555
3) 1555 is the odd composite number because
a) It has factors 1, 5, 311 and 1555
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all