It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 994 518 is not a prime number.
For example, 994 518 can be divided by 2: 994 518 / 2 = 497 259.
For 994 518 to be a prime number, it would have been required that 994 518 has only two divisors, i.e., itself and 1.
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994 518 is an even number, because it is evenly divisible by 2: 994 518 / 2 = 497 259.
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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 994 518 is about 997.255.
Thus, the square root of 994 518 is not an integer, and therefore 994 518 is not a square number.
The square of a number (here 994 518) is the result of the product of this number (994 518) by itself (i.e., 994 518 × 994 518); the square of 994 518 is sometimes called "raising 994 518 to the power 2", or "994 518 squared".
The square of 994 518 is 989 066 052 324 because 994 518 × 994 518 = 994 5182 = 989 066 052 324.
As a consequence, 994 518 is the square root of 989 066 052 324.
The multiples of 994 518 are all integers evenly divisible by 994 518, that is all numbers such that the remainder of the division by 994 518 is zero. There are infinitely many multiples of 994 518. The smallest multiples of 994 518 are: