Is 25 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 25 is composite or not first we have to find its factors.
Contents
Factors of 25:
- If we have taken numbers from 1, 2, 3…for checking factors of 25, we found that 25 has factors 1, 5 and 25. Hence, we must say that 25 is a composite number.
- Thus, 25 is the composite number.
- If we multiply 25 by 1, 2, 3, then we get the multiples of 25 which are 25, 50…and so on.
About the number 25:
- 25 has more than two factors which are 1, 5 and 25 and hence it is the composite number.
- 25 is the odd composite number and it is the perfect square also.
- If we divide 25 by 1, 5 and 25 then we get remainder as zero. Hence, 1, 5 and 25 are the factors of 25.
Note:
- 25 is the perfect square.
- Factors of 25: 1, 5, 25
- Prime factors of 25: 5
Conclusion:
- 25 is the composite number which has factors 1, 5 and 25.
- And hence, 25 is not the prime number.
Multiple Choice Questions:
1) 25 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 25 are
a) 1
b) 5
c) Both a and b
d) 251
Ans: b) 5
3) 1 is the not prime factor of 25 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