Is 77 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 77 is composite or not first we have to find its factors.
Contents
Factors of 77:
- If we have taken numbers from 1, 2, 3…for checking factors of 77, we found that 77 has factors 1, 7, 11 and 77. Hence, we must say that 77 is a composite number.
- Thus, 77 is the composite number.
- If we multiply 77 by 1, 2, 3 then we get the multiples of 77 which are 77, 154. and so on.
About the number 77:
- 77 has more than two factors which are 1,7, 11and 77 and hence it is the composite number.
- 77 is the odd composite number and it is not the perfect square also.
- If we divide 77 by 1, 7, 11 and 77 then we get remainder as zero. Hence, 1, 7, 11 and 77 are the factors of 77.
Note:
- 77 is not the perfect square.
- Factors of 77: 1, 7, 11 and 77
- Prime factors of 77: 7, 11
Conclusion:
- 77 is the composite number which has factors 1, 7, 11 and 77.
- And hence, 77 is not the prime number.
Multiple Choice Questions:
1) 77 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 77 are
a) 1
b) 7, 11
c) Both a and b
d) 771
Ans: b)7, 11
3) 1 is the not prime factor of 77 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