It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 801 021 is not a prime number.
For example, 6 801 021 can be divided by 3: 6 801 021 / 3 = 2 267 007.
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For 6 801 021 to be a prime number, it would have been required that 6 801 021 has only two divisors, i.e., itself and 1.
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6 801 021 is an odd number, because it is not evenly divisible by 2.
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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 6 801 021 is about 2 607.877.
Thus, the square root of 6 801 021 is not an integer, and therefore 6 801 021 is not a square number.
The square of a number (here 6 801 021) is the result of the product of this number (6 801 021) by itself (i.e., 6 801 021 × 6 801 021); the square of 6 801 021 is sometimes called "raising 6 801 021 to the power 2", or "6 801 021 squared".
The square of 6 801 021 is 46 253 886 642 441 because 6 801 021 × 6 801 021 = 6 801 0212 = 46 253 886 642 441.
As a consequence, 6 801 021 is the square root of 46 253 886 642 441.
The multiples of 6 801 021 are all integers evenly divisible by 6 801 021, that is all numbers such that the remainder of the division by 6 801 021 is zero. There are infinitely many multiples of 6 801 021. The smallest multiples of 6 801 021 are: