Is 651 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 651 is composite or not first we have to find its factors.
Contents
Factors of 651:
- If we have taken numbers from 1, 2, 3…for checking factors of 651, we found that 651 has factors 1, 3, 7, 21, 31, 93, 217 and 651. Hence, we must say that 651 is a composite number.
- Thus, 651 is the composite number.
- If we multiply 651 by 1, 2, 3 then we get the multiples of 651 which are 651, 1302 and so on.
651 is a Composite number or Prime number
About the number 651:
- 651 has more than two factors which are 1, 3, 7, 21, 31, 93, 217 and 651 and hence it is the composite number.
- 651 is the odd composite number and it is not the perfect square also.
- If we divide 651 by 1, 3, 7, 21, 31, 93, 217 and 651 then we get remainder as zero. Hence, 1, 3, 7, 21, 31, 93, 217 and 651 are the factors of 651.
Note:
- 651 is not the perfect square.
- Factors of 651: 1, 3, 7, 21, 31, 93, 217 and 651
- Prime factors of 651: 3, 7, 31
Conclusion:
- 651 is the composite number which has factors 1, 3, 7, 21, 31, 93, 217 and 651.
- And hence, 651 is not the prime number.
Multiple Choice Questions:
1) 651 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 651 are
a) 1
b) 3, 7, 31
c) 1, 21, 93, 217 and 651
d) 1, 3, 7, 21, 31, 93, 217 and 651
Ans: b) 3, 7, 31
3) 651 is the odd composite number because
a) It has factors 1, 3, 7, 21, 31, 93, 217 and 651
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c