It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 842 749 is not a prime number.
For example, 7 842 749 can be divided by 47: 7 842 749 / 47 = 166 867.
For 7 842 749 to be a prime number, it would have been required that 7 842 749 has only two divisors, i.e., itself and 1.
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7 842 749 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 7 842 749 is about 2 800.491.
Thus, the square root of 7 842 749 is not an integer, and therefore 7 842 749 is not a square number.
The square of a number (here 7 842 749) is the result of the product of this number (7 842 749) by itself (i.e., 7 842 749 × 7 842 749); the square of 7 842 749 is sometimes called "raising 7 842 749 to the power 2", or "7 842 749 squared".
The square of 7 842 749 is 61 508 711 877 001 because 7 842 749 × 7 842 749 = 7 842 7492 = 61 508 711 877 001.
As a consequence, 7 842 749 is the square root of 61 508 711 877 001.
The multiples of 7 842 749 are all integers evenly divisible by 7 842 749, that is all numbers such that the remainder of the division by 7 842 749 is zero. There are infinitely many multiples of 7 842 749. The smallest multiples of 7 842 749 are: