What is prime number5 15 25?

A Prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Among the numbers you listed—5, 15, and 25—only 5 is a prime number, as it can only be divided evenly by 1 and 5. In contrast, 15 and 25 have divisors other than 1 and themselves, making them composite numbers.