It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 18 816 is not a prime number.
For example, 18 816 can be divided by 2: 18 816 / 2 = 9 408.
For 18 816 to be a prime number, it would have been required that 18 816 has only two divisors, i.e., itself and 1.
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18 816 is an even number, because it is evenly divisible by 2: 18 816 / 2 = 9 408.
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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 18 816 is about 137.171.
Thus, the square root of 18 816 is not an integer, and therefore 18 816 is not a square number.
The square of a number (here 18 816) is the result of the product of this number (18 816) by itself (i.e., 18 816 × 18 816); the square of 18 816 is sometimes called "raising 18 816 to the power 2", or "18 816 squared".
The square of 18 816 is 354 041 856 because 18 816 × 18 816 = 18 8162 = 354 041 856.
As a consequence, 18 816 is the square root of 354 041 856.
The multiples of 18 816 are all integers evenly divisible by 18 816, that is all numbers such that the remainder of the division by 18 816 is zero. There are infinitely many multiples of 18 816. The smallest multiples of 18 816 are: