Is 3980 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 3980 is composite or not first we have to find its factors.
Contents
Factors of 3980:
- If we have taken numbers from 1, 2, 3…for checking factors of 3980, we found that 3980 has factors 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980. Hence, we must say that 3980 is a composite number.
- Thus, 3980 is the composite number.
- If we multiply 3980 by 1, 2, 3 then we get the multiples of 3980 which are 3980, 7960 and so on.
About the number 3980:
- 3980 has more than two factors which are 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980 and hence it is the composite number.
- 3980 is the even composite number and it is not the perfect square also.
- If we divide 3980 by, 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980 then we get remainder as zero. Hence, 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980 are the factors of 3980.
Note:
- 3980 is not the perfect square.
- Factors of 3980: 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980
- Prime factors of 3980: 2, 5, 199
Conclusion:
- 3980 is the composite number which has factors, 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980
- And hence, 3980 is not the prime number.
Multiple Choice Questions:
1) 3980 is a
a) Prime number
b) Even number
c) Composite number
d) Both b and c
Ans: d) both b and c
2) The composite factors of a composite number 3980 are
a) 3980
b) 2, 5, 199
c) 4, 10, 20, 398, 796, 995, 1990 and 3980
d) 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980
Ans: c) 4, 10, 20, 398, 796, 995, 1990 and 3980
3) 3980 is composite number because
a) It has factors 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990 and 3980
b) It has more than two factors
c) Divisible by 2
d) Both a and b
Ans: d) both a and b