It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 404 537 is not a prime number.
For example, 6 404 537 can be divided by 487: 6 404 537 / 487 = 13 151.
For 6 404 537 to be a prime number, it would have been required that 6 404 537 has only two divisors, i.e., itself and 1.
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6 404 537 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 6 404 537 is about 2 530.719.
Thus, the square root of 6 404 537 is not an integer, and therefore 6 404 537 is not a square number.
The square of a number (here 6 404 537) is the result of the product of this number (6 404 537) by itself (i.e., 6 404 537 × 6 404 537); the square of 6 404 537 is sometimes called "raising 6 404 537 to the power 2", or "6 404 537 squared".
The square of 6 404 537 is 41 018 094 184 369 because 6 404 537 × 6 404 537 = 6 404 5372 = 41 018 094 184 369.
As a consequence, 6 404 537 is the square root of 41 018 094 184 369.
The multiples of 6 404 537 are all integers evenly divisible by 6 404 537, that is all numbers such that the remainder of the division by 6 404 537 is zero. There are infinitely many multiples of 6 404 537. The smallest multiples of 6 404 537 are: