Is 646 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 646 is composite or not first we have to find its factors.
Contents
Factors of 646:
- If we have taken numbers from 1, 2, 3…for checking factors of 646, we found that 646 has factors 1, 2, 17, 19, 34, 38, 323 and 646. Hence, we must say that 646 is a composite number.
- Thus, 646 is the composite umber.
- If we multiply 646 by 1, 2, 3 then we get the multiples of 646 which are 646, 1292 and so on.
About the number 646:
- 646 has more than two factors which are 1, 2, 17, 19, 34, 38, 323 and 646 and hence it is the composite number.
- 646 is the even composite number and it is not the perfect square also.
- If we divide 646 by 1, 2, 17, 19, 34, 38, 323 and 646 then we get remainder as zero. Hence, 1, 2, 17, 19, 34, 38, 323 and 646 are the factors of 646.
Note:
- 646 is not the perfect square.
- Factors of 646: 1, 2, 17, 19, 34, 38, 323 and 646
- Prime factors of 646: 2, 17, 19
Conclusion:
- 646 is the composite number which has factors 1, 2, 17, 19, 34, 38, 323 and 646
- And hence, 646 is not the prime number.
Multiple Choice Questions:
1) 646 is a
a) Not a perfect square number
b) Even number
c) Composite number
d) all
Ans: d) all
2) The prime and composite factors of a composite number 646 are
a) 1
b) 2, 17, 19
c) 1, 34, 38, 323 and 646
d) 1, 2, 17, 19, 34, 38, 323 and 646
Ans: d) 1, 2, 17, 19, 34, 38, 323 and 646
3) 646 is the even composite number because
a) It has factors 1, 2, 17, 19, 34, 38, 323 and 646
b) More than two factors
c) Divisible by 2
d) all
Ans: d) all