Is 1921 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 1921 is composite or not first we have to find its factors.
Contents
Factors of 1921:
- If we have taken numbers from 1, 2, 3…for checking factors of 1921, we found that 1921 has factors 1, 17, 113 and 1921. Hence, we must say that 1921 is a composite number.
- Thus, 1921 is the composite number.
- If we multiply 1921 by 1, 2, 3 then we get the multiples of 1921 which are 1921, 3842 and so on.
1921 is a Composite number or Prime number
About the number 1921:
- 1921 has more than two factors which are 1, 17, 113 and 1921 and hence it is the composite number.
- 1921 is the odd composite number and it is not the perfect square also.
- If we divide 1921 by 1, 17, 113 and 1921 then we get remainder as zero. Hence, 1, 17, 113 and 1921 are the factors of 1921
Note:
- 1921 is not the perfect square.
- Factors of 1921: 1, 17, 113 and 1921
- Prime factors of 1921: 17, 113
Conclusion:
- 1921 is the composite number which has factors 1, 17, 113 and 1921.
- And hence, 1921 is not the prime number.
Multiple Choice Questions:
1) 1921 is a
a) Even number
b) Prime number
c) Composite number
d) Both a and c
Ans: c) composite number
2) The non-prime factors of a composite number 1921 are
a) 1
b) 17, 113
c) 1 and 1921
d) 1, 17, 113 and 1921
Ans: b) 1 and 1921
3) 1921 is the odd composite number because
a) It has factors 1, 17, 113 and 1921
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all