Is 2139 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 2139 is composite or not first we have to find its factors.
Contents
Factors of 2139:
- If we have taken numbers from 1, 2, 3…for checking factors of 2139, we found that 2139 has factors 1, 3, 23, 31, 69, 93, 713 and 2139. Hence, we must say that 2139 is a composite number.
- Thus, 2139 is the composite number.
- If we multiply 2139 by 1, 2, 3 then we get the multiples of 2139 which are 2139, 4278 and so on.
2139 is a Composite number or Prime number
About the number 2139:
- 2139 has more than two factors which are 1, 3, 23, 31, 69, 93, 713 and 2139 and hence it is the composite number.
- 2139 is the odd composite number and it is not the perfect square also.
- If we divide 2139 by 1, 3, 23, 31, 69, 93, 713 and 2139 then we get remainder as zero. Hence, 1, 3, 23, 31, 69, 93, 713 and 2139 are the factors of 2139
Note:
- 2139 is not the perfect square.
- Factors of 2139: 1, 3, 23, 31, 69, 93, 713 and 2139
- Prime factors of 2139: 3, 23, 31
Conclusion:
- 2139 is the composite number which has factors 1, 3, 23, 31, 69, 93, 713 and 2139.
- And hence, 2139 is not the prime number.
Multiple Choice Questions:
1) 2139 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 2139 are
a) 1
b) 3, 23, 31
c) 1 and 2139
d) 1, 3, 23, 31, 69, 93, 713 and 2139
Ans: b) 3, 23, 31
3) 2139 is the composite number because
a) It has factors 1, 3, 23, 31, 69, 93, 713 and 2139
b) It has more than two factors
c) It is not divisible by 2
d) Both a and b
Ans: d) both a and b