Is 243 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 243 is composite or not first we have to find its factors.
Contents
Factors of 243:
- If we have taken numbers from 1, 2, 3…for checking factors of 243, we found that 243 has factors 1, 3, 9, 27, 81 and 243. Hence, we must say that 243 is a composite number.
- Thus, 243 is the composite number.
- If we multiply 243 by 1, 2, 3 then we get the multiples of 243 which are 243, 486, and so on.
243 is a Composite number or Prime number
About the number 243:
- 243 has more than two factors which are 1, 3, 9, 27, 81 and 243 and hence it is the composite number.
- 243 is the odd composite number and it is not the perfect square also.
- If we divide 243 by 1, 3, 9, 27, 81 and 243 then we get remainder as zero. Hence, 1, 3, 9, 27, 81 and 243 are the factors of 243.
Note:
- 243 is not the perfect square.
- Factors of 243: 1, 3, 9, 27, 81 and 243
- Prime factors of 243: 3
Conclusion:
- 243 is the composite number which has factors 1, 3, 9, 27, 81 and 243.
- And hence, 243 is not the prime number.
Multiple Choice Questions:
1) 243 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 243 are
a) 1
b) 3
c) 1, 3, 9, 27, 81 and 243
d) 1, 9, 27, 81 and 243
Ans: b) 3
3) 243 is the odd composite number because
a) It has factors 1, 3, 9, 27, 81 and 243
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c