Is 157 is a prime 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 157 is prime or not first we have to find its factors.
Contents
Factors of 157:
- If we have taken numbers from 1, 2, 3…for checking factors of 157, we found that 157 has factors 1 and the number 157 itself. Hence, we must say that 157 is a prime number.
- Thus, 157 is the prime number.
- Here, 157 is the odd prime number.
- If we multiply 157 by 1, 2, 3, then we get the multiples of 157 which are 157, 314, 471…and so on.
About the number 157:
- 157has only two factors which are 1 and the number itself and hence 157 is the prime number.
- 157is the odd prime number and it is not the perfect square also.
- If we divide 157 by 1 and the number itself then we get remainder as zero. Hence, 1 and 157 are the factors of 157.
Note:
- 157 is not the perfect square.
- Factors of 157: 1 and 157
- Prime factors of 157: 157 (since, 157 is the only one prime number which is the factor of 157.)
Conclusion:
- 157is the prime number which has factors 1 and 157.
- And hence, 157 is the prime number.
Multiple Choice Questions:
1) 157 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and b
Ans: d) both a and b
2) The prime factors of a prime number 157are
a) 1
b) 157
c) Both a and b
d) 0
Ans: b) 157
3) 1 is the not prime factor of 157 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