Is 1985 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 1985 is composite or not first we have to find its factors.
Contents
Factors of 1985:
- If we have taken numbers from 1, 2, 3…for checking factors of 1985, we found that 1985 has factors 1, 5, 397 and 1985. Hence, we must say that 1985 is a composite number.
- Thus, 1985 is the composite number.
- If we multiply 1985 by 1, 2, 3 then we get the multiples of 1985 which are 1985, 3970 and so on.
1985 is a Composite number or Prime number
About the number 1985:
- 1985 has more than two factors which are 1, 5, 397 and 1985 and hence it is the composite number.
- 1985 is the odd composite number and it is not the perfect square also.
- If we divide 1985 by 1, 5, 397 and 1985 then we get remainder as zero. Hence, 1, 5, 397 and 1985 are the factors of 1985
Note:
- 1985 is not the perfect square.
- Factors of 1985: 1, 5, 397 and 1985
- Prime factors of 1985: 5, 397
Conclusion:
- 1985 is the composite number which has factors 1, 5, 397 and 1985.
- And hence, 1985 is not the prime number.
Multiple Choice Questions:
1) 1985 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 1985 are
a) 1
b) 5, 397
c) 1 and 1985
d) 1, 5, 397 and 1985
Ans: c) 1 and 1985
3) 1985 is the odd composite number because
a) It has factors 1, 5, 397 and 1985
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all