It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 513 616 is not a prime number.
For example, 513 616 can be divided by 2: 513 616 / 2 = 256 808.
For 513 616 to be a prime number, it would have been required that 513 616 has only two divisors, i.e., itself and 1.
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513 616 is an even number, because it is evenly divisible by 2: 513 616 / 2 = 256 808.
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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 513 616 is about 716.670.
Thus, the square root of 513 616 is not an integer, and therefore 513 616 is not a square number.
The square of a number (here 513 616) is the result of the product of this number (513 616) by itself (i.e., 513 616 × 513 616); the square of 513 616 is sometimes called "raising 513 616 to the power 2", or "513 616 squared".
The square of 513 616 is 263 801 395 456 because 513 616 × 513 616 = 513 6162 = 263 801 395 456.
As a consequence, 513 616 is the square root of 263 801 395 456.
The multiples of 513 616 are all integers evenly divisible by 513 616, that is all numbers such that the remainder of the division by 513 616 is zero. There are infinitely many multiples of 513 616. The smallest multiples of 513 616 are: