It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 18 009 642 is not a prime number.
For example, 18 009 642 can be divided by 2: 18 009 642 / 2 = 9 004 821.
For 18 009 642 to be a prime number, it would have been required that 18 009 642 has only two divisors, i.e., itself and 1.
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18 009 642 is an even number, because it is evenly divisible by 2: 18 009 642 / 2 = 9 004 821.
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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 18 009 642 is about 4 243.777.
Thus, the square root of 18 009 642 is not an integer, and therefore 18 009 642 is not a square number.
The square of a number (here 18 009 642) is the result of the product of this number (18 009 642) by itself (i.e., 18 009 642 × 18 009 642); the square of 18 009 642 is sometimes called "raising 18 009 642 to the power 2", or "18 009 642 squared".
The square of 18 009 642 is 324 347 204 968 164 because 18 009 642 × 18 009 642 = 18 009 6422 = 324 347 204 968 164.
As a consequence, 18 009 642 is the square root of 324 347 204 968 164.
18 009 642 is a number with 8 digits.
The multiples of 18 009 642 are all integers evenly divisible by 18 009 642, that is all numbers such that the remainder of the division by 18 009 642 is zero. There are infinitely many multiples of 18 009 642. The smallest multiples of 18 009 642 are: