It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 628 004 is not a prime number.
For example, 628 004 can be divided by 2: 628 004 / 2 = 314 002.
For 628 004 to be a prime number, it would have been required that 628 004 has only two divisors, i.e., itself and 1.
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628 004 is an even number, because it is evenly divisible by 2: 628 004 / 2 = 314 002.
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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 628 004 is about 792.467.
Thus, the square root of 628 004 is not an integer, and therefore 628 004 is not a square number.
The square of a number (here 628 004) is the result of the product of this number (628 004) by itself (i.e., 628 004 × 628 004); the square of 628 004 is sometimes called "raising 628 004 to the power 2", or "628 004 squared".
The square of 628 004 is 394 389 024 016 because 628 004 × 628 004 = 628 0042 = 394 389 024 016.
As a consequence, 628 004 is the square root of 394 389 024 016.
The multiples of 628 004 are all integers evenly divisible by 628 004, that is all numbers such that the remainder of the division by 628 004 is zero. There are infinitely many multiples of 628 004. The smallest multiples of 628 004 are: