It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 521 328 is not a prime number.
For example, 521 328 can be divided by 2: 521 328 / 2 = 260 664.
For 521 328 to be a prime number, it would have been required that 521 328 has only two divisors, i.e., itself and 1.
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521 328 is an even number, because it is evenly divisible by 2: 521 328 / 2 = 260 664.
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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 521 328 is about 722.030.
Thus, the square root of 521 328 is not an integer, and therefore 521 328 is not a square number.
The square of a number (here 521 328) is the result of the product of this number (521 328) by itself (i.e., 521 328 × 521 328); the square of 521 328 is sometimes called "raising 521 328 to the power 2", or "521 328 squared".
The square of 521 328 is 271 782 883 584 because 521 328 × 521 328 = 521 3282 = 271 782 883 584.
As a consequence, 521 328 is the square root of 271 782 883 584.
The multiples of 521 328 are all integers evenly divisible by 521 328, that is all numbers such that the remainder of the division by 521 328 is zero. There are infinitely many multiples of 521 328. The smallest multiples of 521 328 are: