It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 620 628 is not a prime number.
For example, 620 628 can be divided by 2: 620 628 / 2 = 310 314.
For 620 628 to be a prime number, it would have been required that 620 628 has only two divisors, i.e., itself and 1.
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620 628 is an even number, because it is evenly divisible by 2: 620 628 / 2 = 310 314.
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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 620 628 is about 787.799.
Thus, the square root of 620 628 is not an integer, and therefore 620 628 is not a square number.
The square of a number (here 620 628) is the result of the product of this number (620 628) by itself (i.e., 620 628 × 620 628); the square of 620 628 is sometimes called "raising 620 628 to the power 2", or "620 628 squared".
The square of 620 628 is 385 179 114 384 because 620 628 × 620 628 = 620 6282 = 385 179 114 384.
As a consequence, 620 628 is the square root of 385 179 114 384.
The multiples of 620 628 are all integers evenly divisible by 620 628, that is all numbers such that the remainder of the division by 620 628 is zero. There are infinitely many multiples of 620 628. The smallest multiples of 620 628 are: