It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 138 918 is not a prime number.
For example, 7 138 918 can be divided by 2: 7 138 918 / 2 = 3 569 459.
For 7 138 918 to be a prime number, it would have been required that 7 138 918 has only two divisors, i.e., itself and 1.
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7 138 918 is an even number, because it is evenly divisible by 2: 7 138 918 / 2 = 3 569 459.
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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 7 138 918 is about 2 671.875.
Thus, the square root of 7 138 918 is not an integer, and therefore 7 138 918 is not a square number.
The square of a number (here 7 138 918) is the result of the product of this number (7 138 918) by itself (i.e., 7 138 918 × 7 138 918); the square of 7 138 918 is sometimes called "raising 7 138 918 to the power 2", or "7 138 918 squared".
The square of 7 138 918 is 50 964 150 210 724 because 7 138 918 × 7 138 918 = 7 138 9182 = 50 964 150 210 724.
As a consequence, 7 138 918 is the square root of 50 964 150 210 724.
The multiples of 7 138 918 are all integers evenly divisible by 7 138 918, that is all numbers such that the remainder of the division by 7 138 918 is zero. There are infinitely many multiples of 7 138 918. The smallest multiples of 7 138 918 are: