Is 2021 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 2021 is composite or not first we have to find its factors.
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Factors of 2021:
- If we have taken numbers from 1, 2, 3…for checking factors of 2021, we found that 2021 has factors 1, 43, 47 and 2021. Hence, we must say that 2021 is a composite number.
- Thus, 2021 is the composite number.
- If we multiply 2021 by 1, 2, 3 then we get the multiples of 2021 which are 2021, 4042 and so on.
2021 is a Composite number or Prime number
About the number 2021:
- 2021 has more than two factors which are 1, 43, 47 and 2021 and hence it is the composite number.
- 2021 is the odd composite number and it is not the perfect square also.
- If we divide 2021 by 1, 43, 47 and 2021 then we get remainder as zero. Hence, 1, 43, 47 and 2021 are the factors of 2021
Note:
- 2021 is not the perfect square.
- Factors of 2021: 1, 43, 47 and 2021
- Prime factors of 2021: 43, 47
Conclusion:
- 2021 is the composite number which has factors 1, 43, 47 and 2021.
- And hence, 2021 is not the prime number.
Multiple Choice Questions:
1) 2021 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 2021 are
a) 1
b) 43, 47
c) 1 and 2021
d) 1, 43, 47 and 2021
Ans: c) 1 and 2021
3) 2021 is the odd composite number because
a) It has factors 1, 43, 47 and 2021
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all