7
15
31
57
Answer is Right!
Answer is Wrong!
The odd number in the given list is 15. All other numbers are prime numbers.
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.
7, 31, and 57 are all prime numbers. 15 is not a prime number because it is divisible by 3.