Is 1557 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 1557 is composite or not first we have to find its factors.
Contents
Factors of 1557:
- If we have taken numbers from 1, 2, 3…for checking factors of 1557, we found that 1557 has factors 1, 3, 9, 173, 519 and 1557. Hence, we must say that 1557 is a composite number.
- Thus, 1557 is the composite number.
- If we multiply 1557 by 1, 2, 3 then we get the multiples of 1557 which are 1557, 3114 and so on.
1557 is a Composite number or Prime number
About the number 1557:
- 1557 has more than two factors which are 1, 3, 9, 173, 519 and 1557 and hence it is the composite number.
- 1557 is the odd composite number and it is not the perfect square also.
- If we divide 1557 by 1, 3, 9, 173, 519 and 1557 then we get remainder as zero. Hence, 1, 3, 9, 173, 519 and 1557 are the factors of 1557
Note:
- 1557 is not the perfect square.
- Factors of 1557: 1, 3, 9, 173, 519 and 1557
- Prime factors of 1557: 3, 173
Conclusion:
- 1557 is the composite number which has factors 1, 3, 9, 173, 519 and 1557.
- And hence, 1557 is not the prime number.
Multiple Choice Questions:
1) 1557 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 1557 are
a) 1
b) 3, 173
c) 1, 9, 519 and 1557
d) 1, 3, 9, 173, 519 and 1557
Ans: b) 1, 9, 519 and 1557
3) 1557 is the odd composite number because
a) It has factors 1, 3, 9, 173, 519 and 1557
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all