Is 638 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 638 is composite or not first we have to find its factors.
Contents
Factors of 638:
- If we have taken numbers from 1, 2, 3…for checking factors of 638, we found that 638 has factors 1, 2, 11, 22, 29, 58, 319 and 638. Hence, we must say that 638 is a composite number.
- Thus, 638 is the composite umber.
- If we multiply 638 by 1, 2, 3 then we get the multiples of 638 which are 638, 1276 and so on.
About the number 638:
- 638 has more than two factors which are 1, 2, 11, 22, 29, 58, 319 and 638 and hence it is the composite number.
- 638 is the even composite number and it is not the perfect square also.
- If we divide 638 by 1, 2, 11, 22, 29, 58, 319 and 638 then we get remainder as zero. Hence, 1, 2, 11, 22, 29, 58, 319 and 638 are the factors of 638.
Note:
- 638 is not the perfect square.
- Factors of 638: 1, 2, 11, 22, 29, 58, 319 and 638
- Prime factors of 638: 2, 11, 29
Conclusion:
- 638 is the composite number which has factors 1, 2, 11, 22, 29, 58, 319 and 638
- And hence, 638 is not the prime number.
Multiple Choice Questions:
1) 638 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 638 are
a) 1
b) 2, 11, 29
c) 1, 22, 58, 319 and 638
d) 1, 2, 11, 22, 29, 58, 319 and 638
Ans: d) 1, 2, 11, 22, 29, 58, 319 and 638
3) 638 is the even composite number because
a) It has factors 1, 2, 11, 22, 29, 58, 319 and 638
b) More than two factors
c) Divisible by 2
d) all
Ans: d) all