It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 721 364 is not a prime number.
For example, 6 721 364 can be divided by 2: 6 721 364 / 2 = 3 360 682.
For 6 721 364 to be a prime number, it would have been required that 6 721 364 has only two divisors, i.e., itself and 1.
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6 721 364 is an even number, because it is evenly divisible by 2: 6 721 364 / 2 = 3 360 682.
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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 6 721 364 is about 2 592.559.
Thus, the square root of 6 721 364 is not an integer, and therefore 6 721 364 is not a square number.
The square of a number (here 6 721 364) is the result of the product of this number (6 721 364) by itself (i.e., 6 721 364 × 6 721 364); the square of 6 721 364 is sometimes called "raising 6 721 364 to the power 2", or "6 721 364 squared".
The square of 6 721 364 is 45 176 734 020 496 because 6 721 364 × 6 721 364 = 6 721 3642 = 45 176 734 020 496.
As a consequence, 6 721 364 is the square root of 45 176 734 020 496.
The multiples of 6 721 364 are all integers evenly divisible by 6 721 364, that is all numbers such that the remainder of the division by 6 721 364 is zero. There are infinitely many multiples of 6 721 364. The smallest multiples of 6 721 364 are: