It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 738 is not a prime number.
For example, 20 738 can be divided by 2: 20 738 / 2 = 10 369.
For 20 738 to be a prime number, it would have been required that 20 738 has only two divisors, i.e., itself and 1.
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20 738 is an even number, because it is evenly divisible by 2: 20 738 / 2 = 10 369.
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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 20 738 is about 144.007.
Thus, the square root of 20 738 is not an integer, and therefore 20 738 is not a square number.
The square of a number (here 20 738) is the result of the product of this number (20 738) by itself (i.e., 20 738 × 20 738); the square of 20 738 is sometimes called "raising 20 738 to the power 2", or "20 738 squared".
The square of 20 738 is 430 064 644 because 20 738 × 20 738 = 20 7382 = 430 064 644.
As a consequence, 20 738 is the square root of 430 064 644.
The multiples of 20 738 are all integers evenly divisible by 20 738, that is all numbers such that the remainder of the division by 20 738 is zero. There are infinitely many multiples of 20 738. The smallest multiples of 20 738 are: