It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 664 304 is not a prime number.
For example, 664 304 can be divided by 2: 664 304 / 2 = 332 152.
For 664 304 to be a prime number, it would have been required that 664 304 has only two divisors, i.e., itself and 1.
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664 304 is an even number, because it is evenly divisible by 2: 664 304 / 2 = 332 152.
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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 664 304 is about 815.048.
Thus, the square root of 664 304 is not an integer, and therefore 664 304 is not a square number.
The square of a number (here 664 304) is the result of the product of this number (664 304) by itself (i.e., 664 304 × 664 304); the square of 664 304 is sometimes called "raising 664 304 to the power 2", or "664 304 squared".
The square of 664 304 is 441 299 804 416 because 664 304 × 664 304 = 664 3042 = 441 299 804 416.
As a consequence, 664 304 is the square root of 441 299 804 416.
The multiples of 664 304 are all integers evenly divisible by 664 304, that is all numbers such that the remainder of the division by 664 304 is zero. There are infinitely many multiples of 664 304. The smallest multiples of 664 304 are: