It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 426 747 is not a prime number.
For example, 5 426 747 can be divided by 73: 5 426 747 / 73 = 74 339.
For 5 426 747 to be a prime number, it would have been required that 5 426 747 has only two divisors, i.e., itself and 1.
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5 426 747 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 5 426 747 is about 2 329.538.
Thus, the square root of 5 426 747 is not an integer, and therefore 5 426 747 is not a square number.
The square of a number (here 5 426 747) is the result of the product of this number (5 426 747) by itself (i.e., 5 426 747 × 5 426 747); the square of 5 426 747 is sometimes called "raising 5 426 747 to the power 2", or "5 426 747 squared".
The square of 5 426 747 is 29 449 583 002 009 because 5 426 747 × 5 426 747 = 5 426 7472 = 29 449 583 002 009.
As a consequence, 5 426 747 is the square root of 29 449 583 002 009.
The multiples of 5 426 747 are all integers evenly divisible by 5 426 747, that is all numbers such that the remainder of the division by 5 426 747 is zero. There are infinitely many multiples of 5 426 747. The smallest multiples of 5 426 747 are: