The only possible rectangle is 1 x 11, which identifies 11 as a Prime number.
If the tiles cannot be arranged into a rectangle or square it is a prime number.
The only arrangement is 1 x 11, identifying the number as prime.
You can arrange them in one row or column of 11 tiles, identifying the number as prime.
Identify each number as prime, composite or neither: 1
A prime number is a positive integer with two factors: one and the number itself.
Any prime number has only 2 factors which are itself and one
If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.
When it is divisible by itself and one.
No. Those two non-prime numbers will be factors, so it could not be prime.
Prime squares
Find the prime factorization. Identify the distinct prime factors. Add them up.
13 and 19 are prime. 33 and 45 are composite.