Is 9 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 9 is composite or not first we have to find its factors.
Contents
Factors of 9:
- If we have taken numbers from 1, 2, 3…for checking factors of 9, we found that 9 has factors 1, 3 and 9. Hence, we must say that 9 is a composite number.
- Thus, 9 is the composite number.
- If we multiply 9 by 1, 2, 3, then we get the multiples of 9 which are 9, 18, 27…and so on.
About the number 9:
- 9 has more than two factors which are 1, 3 and 9 and hence it is the composite number.
- 9 is the odd composite number and it isthe perfect square also.
- If we divide 9 by 1, 3 and 9 then we get remainder as zero. Hence, 1, 3 and 9 are the factors of 9.
Note:
- 9 is the perfect square.
- Factors of 9: 1, 3, 9
- Prime factors of 9: 3
Conclusion:
- 9 is the composite number which has factors 1, 3 and 9.
- And hence, 9 is not the prime number.
Multiple Choice Questions:
1) 9 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 9 are
a) 1
b) 3
c) Both a and b
d) 121
Ans: b) 3
3) 1 is the not prime factor of 9 because
a) It is the prime number
b) 1 is neither prime nor composite number
c) Both a and b
d) Given statement is false
Ans: b) 1 is neither prime nor composite number