It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 508 is not a prime number.
For example, 20 508 can be divided by 2: 20 508 / 2 = 10 254.
For 20 508 to be a prime number, it would have been required that 20 508 has only two divisors, i.e., itself and 1.
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20 508 is an even number, because it is evenly divisible by 2: 20 508 / 2 = 10 254.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 20 508 is about 143.206.
Thus, the square root of 20 508 is not an integer, and therefore 20 508 is not a square number.
The square of a number (here 20 508) is the result of the product of this number (20 508) by itself (i.e., 20 508 × 20 508); the square of 20 508 is sometimes called "raising 20 508 to the power 2", or "20 508 squared".
The square of 20 508 is 420 578 064 because 20 508 × 20 508 = 20 5082 = 420 578 064.
As a consequence, 20 508 is the square root of 420 578 064.
The multiples of 20 508 are all integers evenly divisible by 20 508, that is all numbers such that the remainder of the division by 20 508 is zero. There are infinitely many multiples of 20 508. The smallest multiples of 20 508 are: