Is 161 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 161 is composite or not first we have to find its factors.
Contents
Factors of 161:
- If we have taken numbers from 1, 2, 3…for checking factors of 161, we found that 161 has factors 1, 7, 23 and 161. Hence, we must say that 161 is a composite number.
- Thus, 161 is the composite number.
- If we multiply 161 by 1, 2, 3 then we get the multiples of 161 which are 161, 334, and so on.
About the number 161:
- 161 has more than two factors which are 1, 7, 23 and 161 and hence it is the composite number.
- 161 is the odd composite number and it is not the perfect square also.
- If we divide 161 by 1, 7, 23 and 161 then we get remainder as zero. Hence, 1, 7, 23 and 161 are the factors of 161.
Note:
- 161 is not the perfect square.
- Factors of 161: 1, 7, 23 and 161
- Prime factors of 161: 7, 23
Conclusion:
- 161 is the composite number which has factors 1, 7, 23 and 161.
- And hence, 161 is not the prime number.
Multiple Choice Questions:
1) 161 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 161 are
a) 1
b) 7, 23
c) Both a and b
d) 1611
Ans: b) 7, 23
3) 1 is the not prime factor of 161 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