The list of non-composite numbers (being shorter) is easier to print. Composite numbers are the ones not on this list:
1 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499
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The composite numbers between 1000 and 1005 are numbers that have factors other than 1 and themselves. In this range, the numbers 1001, 1002, 1003, and 1004 are composite numbers. 1000 is not a composite number because it is divisible by 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, and 1000.
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
All square numbers greater than 1 are composite.
4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35
Do a quick search on the Web to get a list of prime numbers; all numbers greater than 1 that are not prime are composite. (That is, 0 and 1 should not be listed as "prime numbers", nor as "composite numbers".) Composite numbers are numbers that have at least three factors. A composite number can be divided evenly by 1, itself, and another number. From zero to fifty, they are 2,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39,40,42,45,46,48, and 49.