Is 397 is a prime 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 397 is prime or not first we have to find its factors.
Contents
Factors of 397:
- If we have taken numbers from 1, 2, 3…for checking factors of 397, we found that 397 has factors 1 and the number 397 itself. Hence, we must say that 397 is a prime number.
- Thus, 397 is the prime number.
- Here, 397 is the odd prime number.
- If we multiply 397 by 1, 2, 3, then we get the multiples of 397 which are 397, 794, 1191…and so on.
About the number 397:
- 397 has only two factors which are 1 and the number itself and hence 397 is the prime number.
- 397 is the odd prime number and it is not the perfect square also.
- If we divide 397 by 1 and the number itself then we get remainder as zero. Hence, 1 and 397 are the factors of 397.
Note:
- 397 is not the perfect square.
- Factors of 397: 1 and 397
- Prime factors of 397: 397 (since, 397 is the only one prime number which is the factor of 397.)
Conclusion:
- 397is the prime number which has factors 1 and 397.
- And hence, 397 is the prime number.
Multiple Choice Questions:
1) 397 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and b
Ans: d) both a and b
2) The prime factors of a prime number 397 are
a) 1
b) 397
c) Both a and b
d) 0
Ans: b) 397
3) 1 is the not prime factor of 397 because
a) It is the prime number
b) 1 is neither prime nor composite number
c) Both a and b
d) Given statement is false
Ans: b) 1 is neither prime nor composite number