It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 018 118 is not a prime number.
For example, 5 018 118 can be divided by 2: 5 018 118 / 2 = 2 509 059.
For 5 018 118 to be a prime number, it would have been required that 5 018 118 has only two divisors, i.e., itself and 1.
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5 018 118 is an even number, because it is evenly divisible by 2: 5 018 118 / 2 = 2 509 059.
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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 5 018 118 is about 2 240.116.
Thus, the square root of 5 018 118 is not an integer, and therefore 5 018 118 is not a square number.
The square of a number (here 5 018 118) is the result of the product of this number (5 018 118) by itself (i.e., 5 018 118 × 5 018 118); the square of 5 018 118 is sometimes called "raising 5 018 118 to the power 2", or "5 018 118 squared".
The square of 5 018 118 is 25 181 508 261 924 because 5 018 118 × 5 018 118 = 5 018 1182 = 25 181 508 261 924.
As a consequence, 5 018 118 is the square root of 25 181 508 261 924.
The multiples of 5 018 118 are all integers evenly divisible by 5 018 118, that is all numbers such that the remainder of the division by 5 018 118 is zero. There are infinitely many multiples of 5 018 118. The smallest multiples of 5 018 118 are: