It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 209 216 is not a prime number.
For example, 209 216 can be divided by 2: 209 216 / 2 = 104 608.
For 209 216 to be a prime number, it would have been required that 209 216 has only two divisors, i.e., itself and 1.
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209 216 is an even number, because it is evenly divisible by 2: 209 216 / 2 = 104 608.
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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 is about 457.401.
Thus, the square root of 209 216 is not an integer, and therefore 209 216 is not a square number.
The square of a number (here 209 216) is the result of the product of this number (209 216) by itself (i.e., 209 216 × 209 216); the square of 209 216 is sometimes called "raising 209 216 to the power 2", or "209 216 squared".
The square of 209 216 is 43 771 334 656 because 209 216 × 209 216 = 209 2162 = 43 771 334 656.
As a consequence, 209 216 is the square root of 43 771 334 656.
The multiples of 209 216 are all integers evenly divisible by 209 216, that is all numbers such that the remainder of the division by 209 216 is zero. There are infinitely many multiples of 209 216. The smallest multiples of 209 216 are: