Is 2821 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 2821 is composite or not first we have to find its factors.
Contents
Factors of 2821:
- If we have taken numbers from 1, 2, 3…for checking factors of 2821, we found that 2821 has factors 1, 7, 13, 31, 91, 217, 403 and 2821. Hence, we must say that 2821 is a composite number.
- Thus, 2821 is the composite number.
- If we multiply 2821 by 1, 2, 3 then we get the multiples of 2821 which are 2821, 5642 and so on.
2821 is a Composite number or Prime number
About the number 2821:
- 2821 has more than two factors which are 1, 7, 13, 31, 91, 217, 403 and 2821 and hence it is the composite number.
- 2821 is the odd composite number and it is not the perfect square also.
- If we divide 2821 by 1, 7, 13, 31, 91, 217, 403 and 2821 then we get remainder as zero. Hence 1, 7, 13, 31, 91, 217, 403 and 2821 are the factors of 2821
Note:
- 2821 is not the perfect square.
- Factors of 2821: 1, 7, 13, 31, 91, 217, 403 and 2821
- Prime factors of 2821: 7, 13, 31
Conclusion:
- 2821 is the composite number which has factors 1, 7, 13, 31, 91, 217, 403 and 2821.
- And hence, 2821 is not the prime number.
Multiple Choice Questions:
1) 2821 is a
a) odd number
b) Prime number
c) even number
d) Both a and c
Ans: a) odd number
2) The non-prime factors of a composite number 2821 are
a) 1
b) 7, 13, 31
c) 1, 7, 13, 31, 91, 217, 403 and 2821
d) 1, 91, 217, 403 and 2821
Ans: d) 1, 91, 217, 403 and 2821
3) 2821 is the odd composite number because
a) It has factors 1, 7, 13, 31, 91, 217, 403 and 2821
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all