It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 630 628 is not a prime number.
For example, 630 628 can be divided by 2: 630 628 / 2 = 315 314.
For 630 628 to be a prime number, it would have been required that 630 628 has only two divisors, i.e., itself and 1.
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630 628 is an even number, because it is evenly divisible by 2: 630 628 / 2 = 315 314.
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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 630 628 is about 794.121.
Thus, the square root of 630 628 is not an integer, and therefore 630 628 is not a square number.
The square of a number (here 630 628) is the result of the product of this number (630 628) by itself (i.e., 630 628 × 630 628); the square of 630 628 is sometimes called "raising 630 628 to the power 2", or "630 628 squared".
The square of 630 628 is 397 691 674 384 because 630 628 × 630 628 = 630 6282 = 397 691 674 384.
As a consequence, 630 628 is the square root of 397 691 674 384.
The multiples of 630 628 are all integers evenly divisible by 630 628, that is all numbers such that the remainder of the division by 630 628 is zero. There are infinitely many multiples of 630 628. The smallest multiples of 630 628 are: