It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 494 is not a prime number.
For example, 20 494 can be divided by 2: 20 494 / 2 = 10 247.
For 20 494 to be a prime number, it would have been required that 20 494 has only two divisors, i.e., itself and 1.
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20 494 is an even number, because it is evenly divisible by 2: 20 494 / 2 = 10 247.
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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 20 494 is about 143.157.
Thus, the square root of 20 494 is not an integer, and therefore 20 494 is not a square number.
The square of a number (here 20 494) is the result of the product of this number (20 494) by itself (i.e., 20 494 × 20 494); the square of 20 494 is sometimes called "raising 20 494 to the power 2", or "20 494 squared".
The square of 20 494 is 420 004 036 because 20 494 × 20 494 = 20 4942 = 420 004 036.
As a consequence, 20 494 is the square root of 420 004 036.
The multiples of 20 494 are all integers evenly divisible by 20 494, that is all numbers such that the remainder of the division by 20 494 is zero. There are infinitely many multiples of 20 494. The smallest multiples of 20 494 are: