Is 1643 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 1643 is composite or not first we have to find its factors.
Contents
Factors of 1643:
- If we have taken numbers from 1, 2, 3…for checking factors of 1643, we found that 1643 has factors 1, 31, 53 and 1643. Hence, we must say that 1643 is a composite number.
- Thus, 1643 is the composite number.
- If we multiply 1643 by 1, 2, 3 then we get the multiples of 1643 which are 1643, 3286 and so on.
1643 is a Composite number or Prime number
About the number 1643:
- 1643 has more than two factors which are 1, 31, 53 and 1643 and hence it is the composite number.
- 1643 is the odd composite number and it is not the perfect square also.
- If we divide 1643 by 1, 31, 53 and 1643 then we get remainder as zero. Hence, 1, 31, 53 and 1643 are the factors of 1643
Note:
- 1643 is not the perfect square.
- Factors of 1643: 1, 31, 53 and 1643
- Prime factors of 1643: 31, 53
Conclusion:
- 1643 is the composite number which has factors 1, 31, 53 and 1643.
- And hence, 1643 is not the prime number.
Multiple Choice Questions:
1) 1643 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 1643 are
a) 1
b) 31, 53
c) 1 and 1643
d) 1, 31, 53 and 1643
Ans: b) 1 and 1643
3) 1643 is the odd composite number because
a) It has factors 1, 31, 53 and 1643
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all