It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 994 is not a prime number.
For example, 20 994 can be divided by 2: 20 994 / 2 = 10 497.
For 20 994 to be a prime number, it would have been required that 20 994 has only two divisors, i.e., itself and 1.
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20 994 is an even number, because it is evenly divisible by 2: 20 994 / 2 = 10 497.
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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 20 994 is about 144.893.
Thus, the square root of 20 994 is not an integer, and therefore 20 994 is not a square number.
The square of a number (here 20 994) is the result of the product of this number (20 994) by itself (i.e., 20 994 × 20 994); the square of 20 994 is sometimes called "raising 20 994 to the power 2", or "20 994 squared".
The square of 20 994 is 440 748 036 because 20 994 × 20 994 = 20 9942 = 440 748 036.
As a consequence, 20 994 is the square root of 440 748 036.
The multiples of 20 994 are all integers evenly divisible by 20 994, that is all numbers such that the remainder of the division by 20 994 is zero. There are infinitely many multiples of 20 994. The smallest multiples of 20 994 are: