Is 387 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 387 is composite or not first we have to find its factors.
Contents
Factors of 387:
- If we have taken numbers from 1, 2, 3…for checking factors of 387, we found that 387 has factors 1, 3, 9, 43, 129 and 387. Hence, we must say that 387 is a composite number.
- Thus, 387 is the composite number.
- If we multiply 387 by 1, 2, 3 then we get the multiples of 387 which are 387, 774 and so on.
387 is a Composite number or Prime number
About the number 387:
- 387 has more than two factors which are 1, 3, 9, 43, 129 and 387 and hence it is the composite number.
- 387 is the odd composite number and it is not the perfect square also.
- If we divide 387 by 1, 3, 9, 43, 129 and 387 then we get remainder as zero. Hence, 1, 3, 9, 43, 129 and 387 are the factors of 387.
Note:
- 387 is not the perfect square.
- Factors of 387: 1, 3, 9, 43, 129 and 387
- Prime factors of 387: 3, 43
Conclusion:
- 387 is the composite number which has factors 1, 3, 9, 43, 129 and 387.
- And hence, 387 is not the prime number.
Multiple Choice Questions:
1) 387 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 387 are
a) 1
b) 3, 43
c) 1, 9, 129 and 387
d) 1, 3, 9, 43, 129 and 387
Ans: b) 3, 43
3) 387 is the odd composite number because
a) It has factors 1, 3, 9, 43, 129 and 387
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c