It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 628 638 is not a prime number.
For example, 628 638 can be divided by 2: 628 638 / 2 = 314 319.
For 628 638 to be a prime number, it would have been required that 628 638 has only two divisors, i.e., itself and 1.
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628 638 is an even number, because it is evenly divisible by 2: 628 638 / 2 = 314 319.
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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 628 638 is about 792.867.
Thus, the square root of 628 638 is not an integer, and therefore 628 638 is not a square number.
The square of a number (here 628 638) is the result of the product of this number (628 638) by itself (i.e., 628 638 × 628 638); the square of 628 638 is sometimes called "raising 628 638 to the power 2", or "628 638 squared".
The square of 628 638 is 395 185 735 044 because 628 638 × 628 638 = 628 6382 = 395 185 735 044.
As a consequence, 628 638 is the square root of 395 185 735 044.
The multiples of 628 638 are all integers evenly divisible by 628 638, that is all numbers such that the remainder of the division by 628 638 is zero. There are infinitely many multiples of 628 638. The smallest multiples of 628 638 are: