Is 644 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 644 is composite or not first we have to find its factors.
Contents
Factors of 644:
- If we have taken numbers from 1, 2, 3…for checking factors of 644, we found that 644 has factors 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644. Hence, we must say that 644 is a composite number.
- Thus, 644 is the composite umber.
- If we multiply 644 by 1, 2, 3 then we get the multiples of 644 which are 644, 1288 and so on.
About the number 644:
- 644 has more than two factors which are 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644 and hence it is the composite number.
- 644 is the even composite number and it is not the perfect square also.
- If we divide 644 by 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644 then we get remainder as zero. Hence, 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644 are the factors of 644.
Note:
- 644 is not the perfect square.
- Factors of 644: 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644
- Prime factors of 644: 2, 7, 23
Conclusion:
- 644 is the composite number which has factors 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644
- And hence, 644 is not the prime number.
Multiple Choice Questions:
1) 644 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 644 are
a) 1
b) 2, 7, 23
c) 1, 4, 14, 28, 46, 92, 161, 322 and 644
d) 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644
Ans: d) 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644
3) 644 is the even composite number because
a) It has factors 1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322 and 644
b) More than two factors
c) Divisible by 2
d) all
Ans: d) all