It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 628 513 is not a prime number.
For example, 628 513 can be divided by 277: 628 513 / 277 = 2 269.
For 628 513 to be a prime number, it would have been required that 628 513 has only two divisors, i.e., itself and 1.
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628 513 is an odd number, because it is not evenly divisible by 2.
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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 628 513 is about 792.788.
Thus, the square root of 628 513 is not an integer, and therefore 628 513 is not a square number.
The square of a number (here 628 513) is the result of the product of this number (628 513) by itself (i.e., 628 513 × 628 513); the square of 628 513 is sometimes called "raising 628 513 to the power 2", or "628 513 squared".
The square of 628 513 is 395 028 591 169 because 628 513 × 628 513 = 628 5132 = 395 028 591 169.
As a consequence, 628 513 is the square root of 395 028 591 169.
The multiples of 628 513 are all integers evenly divisible by 628 513, that is all numbers such that the remainder of the division by 628 513 is zero. There are infinitely many multiples of 628 513. The smallest multiples of 628 513 are: