It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 521 318 is not a prime number.
For example, 521 318 can be divided by 2: 521 318 / 2 = 260 659.
For 521 318 to be a prime number, it would have been required that 521 318 has only two divisors, i.e., itself and 1.
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521 318 is an even number, because it is evenly divisible by 2: 521 318 / 2 = 260 659.
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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 521 318 is about 722.024.
Thus, the square root of 521 318 is not an integer, and therefore 521 318 is not a square number.
The square of a number (here 521 318) is the result of the product of this number (521 318) by itself (i.e., 521 318 × 521 318); the square of 521 318 is sometimes called "raising 521 318 to the power 2", or "521 318 squared".
The square of 521 318 is 271 772 457 124 because 521 318 × 521 318 = 521 3182 = 271 772 457 124.
As a consequence, 521 318 is the square root of 271 772 457 124.
The multiples of 521 318 are all integers evenly divisible by 521 318, that is all numbers such that the remainder of the division by 521 318 is zero. There are infinitely many multiples of 521 318. The smallest multiples of 521 318 are: