It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 513 804 is not a prime number.
For example, 513 804 can be divided by 2: 513 804 / 2 = 256 902.
For 513 804 to be a prime number, it would have been required that 513 804 has only two divisors, i.e., itself and 1.
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513 804 is an even number, because it is evenly divisible by 2: 513 804 / 2 = 256 902.
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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 513 804 is about 716.801.
Thus, the square root of 513 804 is not an integer, and therefore 513 804 is not a square number.
The square of a number (here 513 804) is the result of the product of this number (513 804) by itself (i.e., 513 804 × 513 804); the square of 513 804 is sometimes called "raising 513 804 to the power 2", or "513 804 squared".
The square of 513 804 is 263 994 550 416 because 513 804 × 513 804 = 513 8042 = 263 994 550 416.
As a consequence, 513 804 is the square root of 263 994 550 416.
The multiples of 513 804 are all integers evenly divisible by 513 804, that is all numbers such that the remainder of the division by 513 804 is zero. There are infinitely many multiples of 513 804. The smallest multiples of 513 804 are: