Is 1389 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 1389 is composite or not first we have to find its factors.
Contents
Factors of 1389:
- If we have taken numbers from 1, 2, 3…for checking factors of 1389, we found that 1389 has factors 1, 3, 463 and 1389. Hence, we must say that 1389 is a composite number.
- Thus, 1389 is the composite number.
- If we multiply 1389 by 1, 2, 3 then we get the multiples of 1389 which are 1389, 2778 and so on.
1389 is a Composite number or Prime number
About the number 1389:
- 1389 has more than two factors which are 1, 3, 463 and 1389 and hence it is the composite number.
- 1389 is the odd composite number and it is not the perfect square also.
- If we divide 1389 by 1, 3, 463 and 1389 then we get remainder as zero. Hence, 1, 3, 463 and 1389 are the factors of 1389
Note:
- 1389 is not the perfect square.
- Factors of 1389: 1, 3, 463 and 1389
- Prime factors of 1389: 3, 463
Conclusion:
- 1389 is the composite number which has factors 1, 3, 463 and 1389.
- And hence, 1389 is not the prime number.
Multiple Choice Questions:
1) 1389 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 1389 are
a) 1
b) 3, 463
c) 1 and 1389
d) 1, 3, 463 and 1389
Ans: b) 1 and 1389
3) 1389 is the odd composite number because
a) It has factors 1, 3, 463 and 1389
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all