It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 720 638 is not a prime number.
For example, 6 720 638 can be divided by 2: 6 720 638 / 2 = 3 360 319.
For 6 720 638 to be a prime number, it would have been required that 6 720 638 has only two divisors, i.e., itself and 1.
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6 720 638 is an even number, because it is evenly divisible by 2: 6 720 638 / 2 = 3 360 319.
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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 6 720 638 is about 2 592.419.
Thus, the square root of 6 720 638 is not an integer, and therefore 6 720 638 is not a square number.
The square of a number (here 6 720 638) is the result of the product of this number (6 720 638) by itself (i.e., 6 720 638 × 6 720 638); the square of 6 720 638 is sometimes called "raising 6 720 638 to the power 2", or "6 720 638 squared".
The square of 6 720 638 is 45 166 975 127 044 because 6 720 638 × 6 720 638 = 6 720 6382 = 45 166 975 127 044.
As a consequence, 6 720 638 is the square root of 45 166 975 127 044.
The multiples of 6 720 638 are all integers evenly divisible by 6 720 638, that is all numbers such that the remainder of the division by 6 720 638 is zero. There are infinitely many multiples of 6 720 638. The smallest multiples of 6 720 638 are: