Find the odd number / letters / word from the given alternative:

7
15
31
57

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

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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.

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