It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 638 478 is not a prime number.
For example, 7 638 478 can be divided by 2: 7 638 478 / 2 = 3 819 239.
For 7 638 478 to be a prime number, it would have been required that 7 638 478 has only two divisors, i.e., itself and 1.
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7 638 478 is an even number, because it is evenly divisible by 2: 7 638 478 / 2 = 3 819 239.
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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 7 638 478 is about 2 763.780.
Thus, the square root of 7 638 478 is not an integer, and therefore 7 638 478 is not a square number.
The square of a number (here 7 638 478) is the result of the product of this number (7 638 478) by itself (i.e., 7 638 478 × 7 638 478); the square of 7 638 478 is sometimes called "raising 7 638 478 to the power 2", or "7 638 478 squared".
The square of 7 638 478 is 58 346 346 156 484 because 7 638 478 × 7 638 478 = 7 638 4782 = 58 346 346 156 484.
As a consequence, 7 638 478 is the square root of 58 346 346 156 484.
The multiples of 7 638 478 are all integers evenly divisible by 7 638 478, that is all numbers such that the remainder of the division by 7 638 478 is zero. There are infinitely many multiples of 7 638 478. The smallest multiples of 7 638 478 are: