It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 736 is not a prime number.
For example, 20 736 can be divided by 2: 20 736 / 2 = 10 368.
For 20 736 to be a prime number, it would have been required that 20 736 has only two divisors, i.e., itself and 1.
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20 736 is an even number, because it is evenly divisible by 2: 20 736 / 2 = 10 368.
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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 20 736 is 144.
Therefore, the square root of 20 736 is an integer, and as a consequence 20 736 is a perfect square.
The square of a number (here 20 736) is the result of the product of this number (20 736) by itself (i.e., 20 736 × 20 736); the square of 20 736 is sometimes called "raising 20 736 to the power 2", or "20 736 squared".
The square of 20 736 is 429 981 696 because 20 736 × 20 736 = 20 7362 = 429 981 696.
As a consequence, 20 736 is the square root of 429 981 696.
The multiples of 20 736 are all integers evenly divisible by 20 736, that is all numbers such that the remainder of the division by 20 736 is zero. There are infinitely many multiples of 20 736. The smallest multiples of 20 736 are: