It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 9 138 908 is not a prime number.
For example, 9 138 908 can be divided by 2: 9 138 908 / 2 = 4 569 454.
For 9 138 908 to be a prime number, it would have been required that 9 138 908 has only two divisors, i.e., itself and 1.
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9 138 908 is an even number, because it is evenly divisible by 2: 9 138 908 / 2 = 4 569 454.
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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 9 138 908 is about 3 023.063.
Thus, the square root of 9 138 908 is not an integer, and therefore 9 138 908 is not a square number.
The square of a number (here 9 138 908) is the result of the product of this number (9 138 908) by itself (i.e., 9 138 908 × 9 138 908); the square of 9 138 908 is sometimes called "raising 9 138 908 to the power 2", or "9 138 908 squared".
The square of 9 138 908 is 83 519 639 432 464 because 9 138 908 × 9 138 908 = 9 138 9082 = 83 519 639 432 464.
As a consequence, 9 138 908 is the square root of 83 519 639 432 464.
The multiples of 9 138 908 are all integers evenly divisible by 9 138 908, that is all numbers such that the remainder of the division by 9 138 908 is zero. There are infinitely many multiples of 9 138 908. The smallest multiples of 9 138 908 are: