It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 720 642 is not a prime number.
For example, 6 720 642 can be divided by 2: 6 720 642 / 2 = 3 360 321.
For 6 720 642 to be a prime number, it would have been required that 6 720 642 has only two divisors, i.e., itself and 1.
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6 720 642 is an even number, because it is evenly divisible by 2: 6 720 642 / 2 = 3 360 321.
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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 6 720 642 is about 2 592.420.
Thus, the square root of 6 720 642 is not an integer, and therefore 6 720 642 is not a square number.
The square of a number (here 6 720 642) is the result of the product of this number (6 720 642) by itself (i.e., 6 720 642 × 6 720 642); the square of 6 720 642 is sometimes called "raising 6 720 642 to the power 2", or "6 720 642 squared".
The square of 6 720 642 is 45 167 028 892 164 because 6 720 642 × 6 720 642 = 6 720 6422 = 45 167 028 892 164.
As a consequence, 6 720 642 is the square root of 45 167 028 892 164.
The multiples of 6 720 642 are all integers evenly divisible by 6 720 642, that is all numbers such that the remainder of the division by 6 720 642 is zero. There are infinitely many multiples of 6 720 642. The smallest multiples of 6 720 642 are: