Is 921 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 921 is composite or not first we have to find its factors.
Contents
Factors of 921:
- If we have taken numbers from 1, 2, 3…for checking factors of 921, we found that 921 has factors 1, 3, 307 and 921. Hence, we must say that 921 is a composite number.
- Thus, 921 is the composite number.
- If we multiply 921 by 1, 2, 3 then we get the multiples of 921 which are 921, 1842 and so on.
921 is a Composite number or Prime number
About the number 921:
- 921 has more than two factors which are 1, 3, 307 and 921 and hence it is the composite number.
- 921 is the odd composite number and it is not the perfect square also.
- If we divide 921 by 1, 3, 307 and 921 then we get remainder as zero. Hence, 1, 3, 307 and 921 are the factors of 921
Note:
- 921 is not the perfect square.
- Factors of 921: 1, 3, 307 and 921
- Prime factors of 921: 3, 307
Conclusion:
- 921 is the composite number which has factors 1, 3, 307 and 921.
- And hence, 921 is not the prime number.
Multiple Choice Questions:
1) 921 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 921 are
a) 1
b) 3, 307
c) 1 and 921
d) 1, 3, 307 and 921
Ans: b) 3, 307
3) 921 is the odd composite number because
a) It has factors 1, 3, 307 and 921
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c