It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 18 009 648 is not a prime number.
For example, 18 009 648 can be divided by 2: 18 009 648 / 2 = 9 004 824.
For 18 009 648 to be a prime number, it would have been required that 18 009 648 has only two divisors, i.e., itself and 1.
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18 009 648 is an even number, because it is evenly divisible by 2: 18 009 648 / 2 = 9 004 824.
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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 18 009 648 is about 4 243.778.
Thus, the square root of 18 009 648 is not an integer, and therefore 18 009 648 is not a square number.
The square of a number (here 18 009 648) is the result of the product of this number (18 009 648) by itself (i.e., 18 009 648 × 18 009 648); the square of 18 009 648 is sometimes called "raising 18 009 648 to the power 2", or "18 009 648 squared".
The square of 18 009 648 is 324 347 421 083 904 because 18 009 648 × 18 009 648 = 18 009 6482 = 324 347 421 083 904.
As a consequence, 18 009 648 is the square root of 324 347 421 083 904.
18 009 648 is a number with 8 digits.
The multiples of 18 009 648 are all integers evenly divisible by 18 009 648, that is all numbers such that the remainder of the division by 18 009 648 is zero. There are infinitely many multiples of 18 009 648. The smallest multiples of 18 009 648 are: