Is 423 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 423 is composite or not first we have to find its factors.
Contents
Factors of 423:
- If we have taken numbers from 1, 2, 3…for checking factors of 423, we found that 423 has factors 1, 3, 9, 47, 141 and 423. Hence, we must say that 423 is a composite number.
- Thus, 423 is the composite number.
- If we multiply 423 by 1, 2, 3 then we get the multiples of 423 which are 423, 846 and so on.
423 is a Composite number or Prime number
About the number 423:
- 423 has more than two factors which are 1, 3, 9, 47, 141 and 423 and hence it is the composite number.
- 423 is the odd composite number and it is not the perfect square also.
- If we divide 423 by 1, 3, 9, 47, 141 and 423 then we get remainder as zero. Hence, 1, 3, 9, 47, 141 and 423 are the factors of 423.
Note:
- 423 is not the perfect square.
- Factors of 423: 1, 3, 9, 47, 141 and 423
- Prime factors of 423: 3, 47
Conclusion:
- 423 is the composite number which has factors 1, 3, 9, 47, 141 and 423.
- And hence, 423 is not the prime number.
Multiple Choice Questions:
1) 423 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 423 are
a) 1
b) 3, 47
c) 1, 9, 141 and 423
d) 1, 3, 9, 47, 141 and 423
Ans: b) 3, 47
3) 423 is the odd composite number because
a) It has factors 1, 3, 9, 47, 141 and 423
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c