It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 213 216 is not a prime number.
For example, 213 216 can be divided by 2: 213 216 / 2 = 106 608.
For 213 216 to be a prime number, it would have been required that 213 216 has only two divisors, i.e., itself and 1.
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213 216 is an even number, because it is evenly divisible by 2: 213 216 / 2 = 106 608.
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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 213 216 is about 461.753.
Thus, the square root of 213 216 is not an integer, and therefore 213 216 is not a square number.
The square of a number (here 213 216) is the result of the product of this number (213 216) by itself (i.e., 213 216 × 213 216); the square of 213 216 is sometimes called "raising 213 216 to the power 2", or "213 216 squared".
The square of 213 216 is 45 461 062 656 because 213 216 × 213 216 = 213 2162 = 45 461 062 656.
As a consequence, 213 216 is the square root of 45 461 062 656.
The multiples of 213 216 are all integers evenly divisible by 213 216, that is all numbers such that the remainder of the division by 213 216 is zero. There are infinitely many multiples of 213 216. The smallest multiples of 213 216 are: