Is 621 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 621 is composite or not first we have to find its factors.
Contents
Factors of 621:
- If we have taken numbers from 1, 2, 3…for checking factors of 621, we found that 621 has factors 1, 3, 9, 23, 27, 69, 207 and 621. Hence, we must say that 621 is a composite number.
- Thus, 621 is the composite number.
- If we multiply 621 by 1, 2, 3 then we get the multiples of 621 which are 621, 1242 and so on.
621 is a Composite number or Prime number
About the number 621:
- 621 has more than two factors which are 1, 3, 9, 23, 27, 69, 207 and 621 and hence it is the composite number.
- 621 is the odd composite number and it is not the perfect square also.
- If we divide 621 by 1, 3, 9, 23, 27, 69, 207 and 621 then we get remainder as zero. Hence, 1, 3, 9, 23, 27, 69, 207 and 621 are the factors of 621.
Note:
- 621 is not the perfect square.
- Factors of 621: 1, 3, 9, 23, 27, 69, 207 and 621
- Prime factors of 621: 3, 23
Conclusion:
- 621 is the composite number which has factors 1, 3, 9, 23, 27, 69, 207 and 621.
- And hence, 621 is not the prime number.
Multiple Choice Questions:
1) 621 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and c
Ans: d) both a and c
2) The prime factors of a composite number 621 are
a) 1
b) 3, 23
c) 1, 9, 27, 69, 207 and 621
d) 1, 3, 9, 23, 27, 69, 207 and 621
Ans: b) 3, 23
3) 621 is the odd composite number because
a) It has factors 1, 3, 9, 23, 27, 69, 207 and 621
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c