It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 209 216 016 is not a prime number.
For example, 209 216 016 can be divided by 2: 209 216 016 / 2 = 104 608 008.
For 209 216 016 to be a prime number, it would have been required that 209 216 016 has only two divisors, i.e., itself and 1.
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209 216 016 is an even number, because it is evenly divisible by 2: 209 216 016 / 2 = 104 608 008.
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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 209 216 016 is about 14 464.301.
Thus, the square root of 209 216 016 is not an integer, and therefore 209 216 016 is not a square number.
The square of a number (here 209 216 016) is the result of the product of this number (209 216 016) by itself (i.e., 209 216 016 × 209 216 016); the square of 209 216 016 is sometimes called "raising 209 216 016 to the power 2", or "209 216 016 squared".
The square of 209 216 016 is 43 771 341 350 912 256 because 209 216 016 × 209 216 016 = 209 216 0162 = 43 771 341 350 912 256.
As a consequence, 209 216 016 is the square root of 43 771 341 350 912 256.
209 216 016 is a number with 9 digits.
The multiples of 209 216 016 are all integers evenly divisible by 209 216 016, that is all numbers such that the remainder of the division by 209 216 016 is zero. There are infinitely many multiples of 209 216 016. The smallest multiples of 209 216 016 are: