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A prime number is a positive integer greater than 1 that has no positive integer divisors other than 1 and itself. In other words, a prime number is a number that can only be divided evenly by 1 and itself.

Here's a simple program in Kotlin to find all prime numbers up to a given number:

fun main() {
    val limit = 20
    println("Prime numbers up to $limit: ${(2..limit).filter { it.isPrime() }.joinToString(", ")}")
}

fun Int.isPrime(): Boolean = this <= 1 || (2 until this).none { this % it == 0 }

In this program, we start by setting a variable limit to the maximum number we want to check for prime numbers. In this case, we've set it to 20.

Next, we print a message to indicate that we're looking for prime numbers up to the limit.

We then use a for loop to iterate through all the numbers from 2 up to the limit. For each number, we call the isPrime() to determine whether it's a prime number.

The isPrime() takes an integer parameter number and returns a boolean value indicating whether it's a prime number. First, we check if the number is less than or equal to 1, in which case it's not a prime number. Then we use another for loop to check all the numbers from 2 up to one less than the number itself. If we find any number that divides the number evenly, we know it's not a prime number and we return false. If we make it through the entire loop without finding a divisor, we know the number is a prime number and we return true.

When we run the program, it will output all the prime numbers up to the limit we set:

Prime numbers up to 20: 2 3 5 7 11 13 17 19

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