It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 742 487 is not a prime number.
For example, 6 742 487 can be divided by 1 327: 6 742 487 / 1327 = 5 081.
For 6 742 487 to be a prime number, it would have been required that 6 742 487 has only two divisors, i.e., itself and 1.
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6 742 487 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 6 742 487 is about 2 596.630.
Thus, the square root of 6 742 487 is not an integer, and therefore 6 742 487 is not a square number.
The square of a number (here 6 742 487) is the result of the product of this number (6 742 487) by itself (i.e., 6 742 487 × 6 742 487); the square of 6 742 487 is sometimes called "raising 6 742 487 to the power 2", or "6 742 487 squared".
The square of 6 742 487 is 45 461 130 945 169 because 6 742 487 × 6 742 487 = 6 742 4872 = 45 461 130 945 169.
As a consequence, 6 742 487 is the square root of 45 461 130 945 169.
The multiples of 6 742 487 are all integers evenly divisible by 6 742 487, that is all numbers such that the remainder of the division by 6 742 487 is zero. There are infinitely many multiples of 6 742 487. The smallest multiples of 6 742 487 are: