Is 357 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 357 is composite or not first we have to find its factors.
Contents
Factors of 357:
- If we have taken numbers from 1, 2, 3…for checking factors of 357, we found that 357 has factors 1, 3, 7, 17, 21, 51, 119 and 357. Hence, we must say that 357 is a composite number.
- Thus, 357 is the composite number.
- If we multiply 357 by 1, 2, 3 then we get the multiples of 357 which are 357, 714 and so on.
357 is a Composite number or Prime number
About the number 357:
- 357 has more than two factors which are 1, 3, 7, 17, 21, 51, 119 and 357 and hence it is the composite number.
- 357 is the odd composite number and it is not the perfect square also.
- If we divide 357 by 1, 3, 7, 17, 21, 51, 119 and 357 then we get remainder as zero. Hence, 1, 3, 7, 17, 21, 51, 119 and 357 are the factors of 357.
Note:
- 357 is not the perfect square.
- Factors of 357: 1, 3, 7, 17, 21, 51, 119 and 357
- Prime factors of 357: 3, 7, 17
Conclusion:
- 357 is the composite number which has factors 1, 3, 7, 17, 21, 51, 119 and 357.
- And hence, 357 is not the prime number.
Multiple Choice Questions:
1) 357 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 357 are
a) 1
b) 3, 7, 17
c) 1, 21, 51, 119 and 357
d) 1, 3, 7, 17, 21, 51, 119 and 357
Ans: b) 3, 7, 17
3) 357 is the odd composite number because
a) It has factors 1, 3, 7, 17, 21, 51, 119 and 357
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c