Is 721 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 721 is composite or not first we have to find its factors.
Contents
Factors of 721:
- If we have taken numbers from 1, 2, 3…for checking factors of 721, we found that 721 has factors 1, 7, 103 and 721. Hence, we must say that 721 is a composite number.
- Thus, 721 is the composite number.
- If we multiply 721 by 1, 2, 3 then we get the multiples of 721 which are 721, 1442 and so on.
721 is a Composite number or Prime number
About the number 721:
- 721 has more than two factors which are 1, 7, 103 and 721 and hence it is the composite number.
- 721 is the odd composite number and it is not the perfect square also.
- If we divide 721 by 1, 7, 103 and 721 then we get remainder as zero. Hence, 1, 7, 103 and 721 are the factors of 721.
Note:
- 721 is not the perfect square.
- Factors of 721: 1, 7, 103 and 721
- Prime factors of 721: 7, 103
Conclusion:
- 721 is the composite number which has factors 1, 7, 103 and 721.
- And hence, 721 is not the prime number.
Multiple Choice Questions:
1) 721 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 721 are
a) 1
b) 7, 103
c) 1 and 721
d) 1, 7, 103 and 721
Ans: b) 7, 103
3) 721 is the odd composite number because
a) It has factors 1, 7, 103 and 721
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c