Is 647 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 647 is prime or not first we have to find its factors.
Contents
Factors of 647:
- If we have taken numbers from 1, 2, 3…for checking factors of 647, we found that 647 has factors 1 and the number 647 itself. Hence, we must say that 647 is a prime number.
- Thus, 647 is the prime number.
- Here, 647 is the odd prime number.
- If we multiply 647 by 1, 2, 3, then we get the multiples of 647 which are 647, 1294, 1941…and so on.
About the number 647:
- 647 has only two factors which are 1 and the number itself and hence 647 is the prime number.
- 647 is the odd prime number and it is not the perfect square also.
- If we divide 647 by 1 and the number itself then we get remainder as zero. Hence, 1 and 647 are the factors of 647.
Note:
- 647 is not the perfect square.
- Factors of 647: 1 and 647
- Prime factors of 647: 647 (since, 647 is the only one prime number which is the factor of 647.)
Conclusion:
- 647is the prime number which has factors 1 and 647.
- And hence, 647 is the prime number.
Multiple Choice Questions:
1) 647 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 647 are
a) 1
b) 647
c) Both a and b
d) 0
Ans: b) 647
3) 1 is the not prime factor of 647 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