Is 1257 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 1257 is composite or not first we have to find its factors.
Contents
Factors of 1257:
- If we have taken numbers from 1, 2, 3…for checking factors of 1257, we found that 1257 has factors 1, 3, 419 and 1257. Hence, we must say that 1257 is a composite number.
- Thus, 1257 is the composite number.
- If we multiply 1257 by 1, 2, 3 then we get the multiples of 1257 which are 1257, 2514 and so on.
1257 is a Composite number or Prime number
About the number 1257:
- 1257 has more than two factors which are 1, 3, 419 and 1257 and hence it is the composite number.
- 1257 is the odd composite number and it is not the perfect square also.
- If we divide 1257 by 1, 3, 419 and 1257 then we get remainder as zero. Hence, 1, 3, 419 and 1257 are the factors of 1257
Note:
- 1257 is not the perfect square.
- Factors of 1257: 1, 3, 419 and 1257
- Prime factors of 1257: 3, 419
Conclusion:
- 1257 is the composite number which has factors 1, 3, 419 and 1257.
- And hence, 1257 is not the prime number.
Multiple Choice Questions:
1) 1257 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 1257 are
a) 1
b) 3, 419
c) 1 and 1257
d) 1, 3, 419 and 1257
Ans: b) 1 and 1257
3) 1257 is the odd composite number because
a) It has factors 1, 3, 419 and 1257
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all