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